In the Simpsons episode Sunday Cruddy Sunday (S10E12), Homer, Wally and others head to the Super Bowl.
When Homer asks Moe if he'd be interested in going to the Super Bowl he said he'd love to as his favourite team were playing:
Moe: "The Atlanta Falcons"
He covers his mouth with a beer mug when he's saying this. Homer does the same when he says
Homer: "The Denver Broncos"
and then Wally does the same when he mentions the Clintons.
Was there a particular reason for them covering their mouth or just to be a bit strange?
Here is the clip on YouTube.