There s no denying "The Wave" being at the top of every "stupid baseball fan behavior" list. But not too far back in second place is "person who throws back home run ball hit by opposing team."
Your team just gave up a home run. Instead of bringing more attention to the fact that your team just gave up a home run, tuck the ball away and help the home team move on. Also, if you decide to throw the ball back, you risk being an idiot and hitting one of your own players, like this brilliant Yankees fan did with Brett Gardner.
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After Jose Bautista hit a solo home run in the fourth inning to give the Blue Jays a 2-0 lead, a braggadocious Yankees fan believed the best course of action would be to throw the ball back onto the field, and hit Brett Gardner in the process.
Unless you are at Wrigley Field, never throw a home run ball back.
DON'T BE THAT GUY!