I could tell ya what a Koopa is, but why bother when I can show ya? I managed to save some footage from a while back, when the stupid magic turning us all human changed everyone back.

[In fact, he'll slip on a little attachment.]

And of course you're in good company! You're talking to the cream of the crop when it comes to awesome villains. I've been terrorizing the Mushroom Kingdom for eons now!

[Or well, a long time. But eons sounds more impressive.]