There are few occurrences in sports as unexpectedly joyful as foul balls. You never know when a ball could come careening into the stands, and that bit of uncertainty adds a certain level of excitement to the game.

Some of the time foul balls are out of the reach of fans, but when fans have a chance to grab the ball, good things can happen.

Here's a review of the best (and worst) foul ball catches of 2012:

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1939 Dodge Still Runs -- As A Grill
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MLB