It depends. If I am alone I usually wonder when the last time was someone had to push the button for help. Is there actually help on the other end of the button? If I found myself in a Speed type situation, is there a crane or something available somewhere so I can thwart a money hungry madman if I don't end up with a Jack Traven sort of cop?
If I am with my husband and we are alone I will ask if he wants to do it in there since it's still on the to-do list. If we're with other people, I just make mildly obscene gestures with my mouth.