[greymule]

"Goes over" is interpreted to mean "hits something on the other side." It does not indicate anything like breaking the plane of the fence or, as in basketball, being in the cylinder. A ball isn't over the fence until it hits something.

A few years ago, ASA recognized this ambiguity and revised its rule about a ball hitting the glove and then going over the fence. The revision covered a ball that is already "over" the fence when it hits the glove (ie, the fielder reaches beyond the fence and hits it). Most people had interpreted the rule correctly but, probably in response to some sort of protest, ASA spelled out in black and white that either way, it's a four-base award.