Really funny jokes-Trip extension

A guy goes to a travel agent to book a three-week cruise for himself and his wife. A few days before the cruise, the travel agent informs the guy that the cruise is canceled, but he can get them on a seven-day cruise instead. The guy agrees & goes to the the drug store to buy seven medicines for motion sickness and seven condoms.

The next day, the agent calls again to inform now he can book them on 10-day cruise. He guy gives his confirmation and goes back to the drug store to buy three more medicines for motion sickness and three more condoms.

Two days later, the travel agent calls once again to inform that he has a 15-day cruise available now & whether the guy would be interested in taking it. The guy again says he is ok with it & goes back to the drug store to buy five more medicines for motion sickness and 5 more condoms.

Finally, the attendant at the drug store asks him, "Man, if it makes you sick, why do you keep doing it?"