Kramer...
... that guy wanted to seem so authentically funny the he actually requested a real air conditioner for that episode when the four got lost in the garage. So, Kramer was carrying all of that awkward weight all through that episode, and the funny ending (when they finally found the car and it didn't want to start) was an accident that the crew decided to keep (if you look at the back seat passengers, you can actually see them using their hands to cover their faces so that we wouldn't be able to see them laughing so hard). The retake was impossible as they were on tight schedule, and filming all through the day which ended late in the evening when the ending was shot. (The garage, by the way, was a set built especially for that episode ... they made it look real by using mirrors in a very accurate way.)