I constantly make sound effects with my mouth to complement my sometimes-exaggerated gestures. Like, indicating something fast would go like:
1. Swing hand quickly from one side to another with no regard to nearby obstacles
2. Go "ZOOM/FOOM/KAZOOM/VROOM/WHOOSH"
3. Knock over something fragile with swung hand OR smash hand into nearest unyielding surface/corner
It's surprising how often the third step happens. I've by now learned to place fragile things away from my range of motion, so now i just occasionally whack the desk lamp i have sitting near my monitor. It's fortunately not very fragile, since it has survived a two-digit number of whacks by now.