This is the season 1 death. You may be looking for the season 2 death.
Blown Job (season 1) is one of the many deaths.
How it happened...
A drunk clown goes to a party. Behind him in the car, though, a can of CO2 is activated, and his balloon starts inflating. Due to his drunkenness, he does not notice, until his balloon pins him and he suffocates.