1) Crying spontaneously upon entering any restaurant post cruise... this can become ferociously violent crying at buffet restaurants in "the real world".
2) Complaining about towels not mysteriously arranging themselves into towel animals on your bed at home each night. (a spouse can alleviate some of this by secretly placing a cheap chocolate mint on the pillow... these can be "found" for free at most Olive Garden restaurants for those on a budget.)
3) Dancing uncontrollably in bathrooms that are "just too spacious" at home. Also, a sudden fear of flushing the home toilet that's "just too quiet" (if you have an mp3 file of the sound of a missile to air launch, playing this through your mp3 player may help).
4) An unusual tendency to expect some mysterious stranger to come into your room while you are away and clean up everything (including the bathroom!!!) and pretend that you aren't just a slob. (Important Note: most married men have this symptom 24/7, so this isn't generally considered a symptom of PCD with such men)
5) A tendency to try to convince friends and family members back home that they should all love to dance "The Electric Slide", the "Cupid Shuffle", and various other line dances... and spontaneous giddiness when these same songs are (rarely) played at nightclubs and weddings back home. (Note to drunk men everywhere: No, you are not "starting to get it now!")
6) Asking strangers on the street, sometimes emphatically, "Where's my muster station?!?" (Note: first time cruisers suffering from PCD will often shout "Where's my mustard station?!?" in which case they are often led to a nearby hot dog stand.) Fortunately, the sad cases of those purchasing Life Vests and wearing them about town is in a downward trend as Royal Caribbean is making this a thing of the past.
7) Babbling through dinner about needing to hurry up and "get to the theater for a good seat!!!". The employees at McDonald's won't be helpful in telling you the fastest path to the show. (Some limited success can be found by going to a 3D movie.)
8) Some become incoherent when the sales person at the local liquor store "lets" them take the liquor "back to their cabin" (er, home... PCD sufferers often will call home their "cabin" for a few weeks post cruise). This is a no-win situation for everyone... unless you are an unscrupulous liquor salesman who says "sure, I will make sure it's delivered to 'your cabin' by the end of the week" who then goes on to take your liquor and drink it with his buddies. (This is a PCD predator)
8b) A silly and somewhat time wasting need to "sneak" liquor into their own homes; some will even buy mouthwash bottles and empty them in the street refilling them with rum before entering their home with the "mouthwash" in plain sight. (this is often accompanied by grins and high fives when they feel they've gotten past "security"... usually their sleeping dog or equally disinterested cat. Parrots can be taught to ask, "Do you have any liquor?" for those in desperate need to get caught.)
9) A painful need to see EVERY cruise company commercial on TV. DVRs can make this excruciating for those not suffering from PCD who live with PCD sufferers. Listening to things like, "I was on that ship!!!" or "I am going on that ship in 324 days, 16 hours, 12 minutes and 46 seconds from... NOW!" can often lead to the collapse of otherwise healthy relationships.
10) Attempting to build a zipline from your house's roof to your neighbor's roof (generally Oasis-PCD, but growing from port visits as well); attempting to convert a hot tub or pool to a flow rider using leaf blowers and using skateboards as surfboards; demanding croissant sandwiches at your local pizza place... for free!
11) Taking credit cards out of your wallet and trying to figure out how to insert it into your door lock at home. (Note, the credit card will, at least, allow you to charge things with impunity just as the Sea Pass card did on board!)
12) Searching endlessly for your "cabin" safe at home because you know your cell phone, car keys, and jewelry is in there! (Men: you know your wife "moved it" no matter what and it's definitely "not where you left it!")
There are many other symptoms of PCD... the list grows daily. I know... for I am a chronic PCD patient. Again, the so called "medical world" has an attitude that's along the order of "oh, just grow up!" where PCD is concerned.
About the only successful treatment that I've ever found has been to book another cruise. (although some have had limited success by building scale life size models of their cabins in the basement and retiring there between cruises.)
Good luck, fellow PCD sufferers... and know that you are NOT ALONE!
ps- Another great way to end PCD immediately is to buy ME a cruise! Probably won't help your PCD, but definitely will help mine!