A guy goes to a travel agent and books a two-week cruise
for himself and his girlfriend. A couple days before the cruise, the
travel agent calls and says the cruise has been canceled, but he can
get them on a three-day cruise instead. The guy says "OK," and goes to
the pharmacy to buy three Dramamine and three condoms.
Next day, the agent calls back and says he now can book a five-day
cruise. The guy says he'll take it. Returns to the same pharmacy and
buys two more Dramamine and two more condoms.
The following day, the travel agent calls again and says he can now
book an eight-day cruise. Guy says, "OK," and goes back to the drug
store and asks for three more Dramamine and three more condoms.
Finally, the pharmacist asks, "Look, if it makes you sick, how come
you keep doing it?"