"Hey now," Ernie raised his hands in faux-defense, a grin on his face. "I make no claims one way or another at your Charm work. I'm sure it's quite lovely."
Pulling out his wand, Ernie cast a Disillusionment Charm on the tray. "Mine, on the other hand, is impeccable." Which it was, though he was joking.
"Are we ready to go then?" he asked after a moment, heading to the door. He had the sneaking suspicion that it was just after curfew. "...I think we'll need to be quiet, not that we wouldn't be, but at least it's not too far to the common room..."