Heh, my best friend and I made one of those devices that use electricity to pump up your muscles (the aged among us, i.e., most of us, may remember Disneyland having a device that did this). We each held one of the handles and, when my friend's girlfriend came into the room, we each grabbed one of her arms. We didn't feel anything, but it just about blasted her a few feet back! Hehe...
The smarter men around here will probably note that I did NOT do this with my girlfriend (I still liked her and wanted her to stay ? ).