A couple of years ago, I was told by a tourist from Japan that in the Japanese major leagues - if that's not a misnomer...you know what I mean - most of the teams are "unclenching" when it comes to letting fans keep foul balls; previously, I've read they had ushers running around collecting every one and often not being very nice about it. Not sure whether that largesse has filtered down to the minors yet. It's probably a good thing that the ball followed you into the toire.