James Poyser on Tonight Show has a recurrent skit with "thank you notes". The gag involves Poyser, a musician, being asked to play "thank you note music", which he does with a straight face. Jimmy Fallon and his sidekick immediately try to crack him up. James' resistance to the jokes is heroic but usually futile.

The twitter standard reaction-image 'gif' list has included the above giphy clip for years.