Showboating NBA referee Joey Crawford joined a long list of officials in various sports who have suffered injuries recently when he pulled up lame in the second quarter of today's Mavericks-Clippers game with what league officials are calling a knee injury.

Crawford is doubtful to return, and we're curious why this rash of referee illness and injury is occurring:

Ref Breaks Rib After Colliding With Maple Leafs Player, Hitting Ice

NHL Game Interrupted By Puking Referee

Camellia Bowl Official Injured By Object Thrown At Him By A Fan

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Another Referee Knocked Out Of Game Due To Tip Injury

Hockey Fight Ends With Linesman Getting Punched In The Face

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Basketball Referee Collapses After Tossing Opening Tip, Carted Off

Jameis Winston Somehow Got Away With Shoving An Official

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Spanish Player Hits Referee, Himself In The Face With Basketball

Goalkeeper Tries To Rearrange Ref's Face With Haymaker

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Lady Soccer Ref Gets Smoked In The Face By Rocketing Ball

[Prime]

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