Right, you're shooting the eight, but it's obviously impossible to hit. Any attempt would hit an opponent's ball first and sink the eight, which would be a loss.
Our rules: you always plays it as it lies, unless there is a cue ball scratch or jump which is ball-in-hand from the kitchen. When shooting the 8, scratching or jumping the cue ball (whether or not the 8 goes in), sinking an opponent's ball, sinking the 8 in a pocket you don't call, or hitting the opponent's ball first when you sink the eight is a loss. Some of these rules might vary a little depending on who you're playing. The beauty of "bar rules".
Thanks for bringing up pushes! That's a vital point I left out. It's a little ambiguous where I play... basically, you "have to try" which is a retarded rule, because now you get to argue about someone's intentions! Any of the random jerks I play with would probably demand that I "try" to conjure the physical impossibility (lose) or forfeit (lose). Then you're likely to be in for a fight (lose even if you win). No matter what, you LOSE! I guess that kinda answers my question, thanks! LOL.
I asked because a situation similar to this came up in a game between friends. One ball wasn't touching, so after I set her up with a push she was able to wedge it through, knocking the others clear. The "dirty" push set her up for a plausible win, so it seemed fair. Got me to thinking though!
Yeah, bar rules... where the opponent can scratch and make you shoot a long kick from the kitchen at the eight which is frozen to the short rail in the kitchen... but he didn't INTEND that did he?