People have guessed lots of things:

dust
put the toilet seat down
mop the floors
have sex
cleaned the air filter
vacuumed the carpet
ate at the dinner table

But all of those are wrong.

Believe it or not, but Robert has not opened the door to his oven in 5 years!
He says it's because he has a convention oven on his countertop that he uses when he needs to cook anything. And we actually found lots of listeners who haven't opened their ovens in 5 or more years!