I do the same trick with the 'accidental' poke. I say "excuse me" once beforehand, but only the once. Then it's "OH! my bad!" after jabbing them in the kidney gently.
I also get sharked by having to wait for people who seem to come to the pool hall to do any damn thing EXCEPT play pool. First the guy has to sit there and agonize over the jukebox. He really wants me to wait (and pay for the time) when he's got 20 credits!? Then the guy has to wander to the bar, look it all over, make some chitchat with the counter girl, then go say hi to some friends of his. Then he's got to take that all-important phone call. ("not much baby what're you doin'? I'm at the pool hall. Yeah. Uhm, yeah, I think so. No, haha. Yeah. Just chillin' n' playin' my buddy. Uh huh...").
The other night I was playing with the owner in a ring game and had to wait like 10-15 mins. every time it's his shot. Not his fault, I don't hold it against anyone, but damn did it shark me. I dogged a 9 ball, quit the game and rolled out of there and left behind a $300 piece of equipment, I was so rattled.