I had a joke about UDP, but you might not get it.

And that’s why this pun is fun

It’s funny because ‘get it’ has a double meaning: understanding a joke and receiving data. In computer networking, UDP (User Datagram Protocol) sends packets without guaranteeing delivery, so you literally might not ‘get’ (receive) it. The line layers that technical fact over the common phrase, creating a wordplay. To appreciate it, you need to know that UDP is a connectionless protocol that doesn’t ensure packets arrive, and that ‘get it’ is an idiom meaning ‘understand.’