I've only ever gone bowling a handful of times, and, like pretty much any other sport or game, my performance seems to be completely and totally random with no underlying logic behind it whatsoever. Last time I bowled (a few years ago now) I got about a 160, which is probably the highest I've ever got, and was actually quite fun as I was playing against a "serious" bowler (by that I mean the sort of guy who owns his own ball and shoes) and managed to beat him by just a couple of points, which pissed him off to no end (he hadn't had his best game, as you can imagine). Other than that my scores would range randomly for about 50 upwards.