This rivalry came in handy when their trainer gave them a medicine ball to throw back and forth.

Theres no accurate count for how many people were in that stadium!

OBrien yelled as he threw the ball.

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Credit: TBS

Thats what your accountant says, for tax purposes!

Ive seen shots and it looks like 1,500 people tops!

Those are all relatives you invited!

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At the very least, they ended up having a good workout.

You look like youre going to a nice Armenian wedding, OBrien said.

Watch the clip below.