Every time I tried to get my ex wife to try something new, she would say "not there."

Anyway, some suggestions:

Cover the first two letters of all the EXIT signs in a building with your own homeade letters SH.

Stand in an elevator and unbutton a shirt button for each passing floor and see who stays on to the top

Take your girl to a furniture store to "shop" for beds, and by "shop" I mean make out on as many beds as you can.

Go to a historical re-enactment dressed for the wrong period.

Put up a sign at a busy intersection that says "I buy ugly children" and use the phone number of someone you don't like (I use that one on ex wife @ once every 6 months)

Take your dog to the vet and try to have one leg removed because he runs too fast