A What-y and a Who, Now?

"Come on, Shirley, you've got to see this clip!" Bob said, as he slid the arrow back on a Youtube video. Then he played a snip of a football team kicking a ball and some player catching it in the end zone. Then that player threw the ball down in what I can only assume was a victory slam that bounced it out of the end zone. Then a guy in a different colored uniform grabbed the ball and ran into the same end zone the other guy just caught it in.
"Can you believe it?" Bob chuckled. "He got a touchdown with no time on the clock!"
"How could he do that?"
"The ball was still in play."
"But the other guy was there first," I said.
"But he was on the other team."
I cocked my head. "So he intercepted it?"
"No, his team punted it to him."
"So why was he in the other team's end zone?"
(Bob said something I forget now because it made no sense.)
"I don't get it."
"Never mind."
My point is proven - football is just a bunch of guys running around the field crashing into each other, then standing around making random rules in between hits to confuse people like me!