Fixture unit Puns

I’m not sure, but I think this belongs here:

I work night shift as a unit clerk at a hospital, and there is this one old security guard who goes on rounds to every unit. He always stops at my desk and cracks really cheesy, cringe-worthy jokes. He has this one awful (awesome?) knee-slapper that seems to be a permanent fixture in his "dad joke" repertoire. He’s said it 3 or 4 times already since I’ve started working here in March, so I'm pretty sure this joke is constantly on standby for him.

This is the exact conversation every time:

Security dude: How are you doing this fine evening?

Me (purposefully setting myself up for it): Pretty good. How about you?

Security dude: Really? WELL, I’ve never been pretty or good, so I don't know what that's like! Hahahahahaha (continues to laugh like this is the funniest joke that’s ever been told).