I found this website containing a bunch of these "Shoot yourself in the foot jokes" but I did not get this one:
Objective C: You write a protocol for shooting yourself in the foot so that all people can get shot in their feet.
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I assume it is because protocols if defined as required makes sure anyone that uses your class as a delegate must also implement your protocol.
Only thing is you don't have to implement every protocol as many are optional so well, there you go.