Lines to end a date with, so the other person will not be hoping to hear from you again (male to female):

"Tomorrow I have a date with General Pershing."

"Now those Afghans seem to be on to something, don't you think?"

"Would any of your two other sisters have smaller feet perchance?"

"Hobbies? Yes, I have this knife-throwing act which is only missing one thing. That's a joke. Missing one thing, get it!!!"

"There is no trick. You just don't mind the pain." (need a candlelit dinner for this one)

"I had a dress like that once."

"INCOMING!!!!"

yours, Peter T.