Puns, or yo momma (xur, cryptarch guy, xander etc) type of joke are acceptable
Lets see who got them best joke!!!
Edit 1: yeah pick up lines and bar jokes accepted in here!
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An Awoken and an Exo meet up in the Tower. As they're talking, the Exo keeps twitching his head to the side. After a while, the Awoken can't ignore this and asks if the Exo is OK. "Yeah," comes the reply, "I was just hanging out with Xur and I think I've picked up an Exo tic.."