Have you seen this mascot? (Getty Images)

Update: Wally has been found!

With the big series against the Yankees coming up, you knew those pesky kids from New York were going to pull some kind of prank, but this….

We all know what happens next, the dean says nobody's to retaliate, but next thing you know Derek Jeter has gone missing and then it's on!

It must be noted that only the costume -- no person -- has gone missing from Fenway Park.

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