THIS MAKES ME PEE.Totally looks like Loki is breaking out into song.
"Hey kids, do you wanna here about the time I was burdened with glorious purpose?"
or being the asinine kind of sarcastic "OH, LOOK WHO SHOWED UP! BIG BRO WHO JUST DECIDED TO GIVE A SHIT ABOUT ME. LET’S...
It looks like he’s waiting for Thor to laugh at a really bad joke he thought was hilarious.