Because he saw the salad dressing!
or
Only one. But he'll leave a big puddle of spit on the floor underneath him.
or
He was a baaaaaaaaad driver.
or
His breath.
or
Because E.T. eventually went home!
or
Because an undocumented worker has been living on his head for the past 2 decades!
or
The ceremony was rubbish - but the reception was brilliant.
or