Somewhere in the distance they could hear Peeves zooming through the corridors singing a victory song of his own composition:

We did it, we bashed them, wee Potter’s the one,

And Voldy’s gone moldy, so now let’s have fun!

“Really gives a feeling for the scope and tragedy of the thing, doesn’t it?” said Ron, pushing open a door to let Harry and Hermione through.

Harry Potter and the Deathly Hallows – J.K. Rowling