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A UDP packet walks into a bar.

A walks UDP packet bar a into.

I think this is definitely a more accurate representation of the joke. Although maybe drop one of the words. :)

A walks UDP packet bar into bar.

?

Might make more sense as "A TCP Packet walks into a bar" , since TCP supports retransmissions

An UDP packet may arrive as two copies. That's the joke.

Duplication is a form of forward error correction.