Eradicate is really funny in casual when you and your opponent don't know each other's decks very well.

Player 1 casts Mirror Entity

Player 2 exclaims, "Ugh, ANOTHER Mirror Entity?! How many of those do you HAVE in the deck?!"

Player 1 says, "I have four of them in the deck. Yes, that's right."

Player 2 plays Eradicate on the Mirror Entity.

Player 1 does a facepalm.