Killing flies

To killl a fly with your bare hands, clap them together over a fly. They'll see motion and fly upwards to escape, only to fly right between your enclosing palms.

Hamburgers on a pan

If you're cooking hamburgers in a pan (as opposed to on a grill) you do not need to apply a non-stick coating to the pan; ground beef has fat content which is released during the cooking process, which prevents the meat from sticking to the pan.