This guys face turns red when I talk to him, why?

So I joke around a lot in general with everyone.

but I notice a lot that this guy at work has the reddest face ever when I say a joke.

hahaha if anything why not just laugh?

he looks like he's trying hard not to.

his girlfriend is there though.

is she the one telling him not to laugh at my jokes?
This guys face turns red when I talk to him, why?
Post Opinion