The small 15W Line 6 Spiders are pretty good as a practice amp. I play through one when I go to my lessons. They sound great if you're just practicing but if you have a gig, forget it. These guys were playing through one at a school event and it sounded like ass.
Judo. It's all about using the other guy's size and momentum against him. A lot of the moves in judo revolve around getting proper leverage on the guy.