OK this is a really simple one and may not be what you are looking for but it is funny. The Battle of the Wits from the Princess Bride
"All the while making faces like a baby platypus who forget to take some Beano before eating a chimichanga." FindingNamo in reference to Jessica Simpson's singing.
Does race have to be a factor in your scene? Why not something from The Odd Couple.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.