I got this idea from MoonKittyru.
"Who'd like to go next?" No body raised their hand. Ron stomped on Harry's foot, causing him to jump up.
"Ah, Mr. Potter, so good of you to volunteer. What is it you will be singing tonight?"
Harry glared at Ron, then grinned mischievously. Ron gulped.
"I'll be singing I Saw Ronald Kissing Dumbledore." Ron gulped again. Why the hell did he have to pick a song about that incident? Harry got up on stage and started to sing:
"I saw Ronald kissing Dumbledore
Underneath the mistletoe last year
They didn't see Colin creep
To the front to take a peep
But the sure saw the flash
As the camera took a shot
And I saw Ronald kissing Dumbledore
Underneath the mistletoe last year
And what a laugh it always is
When Colin sends out his holiday cards
Of Ronald kissing Dumbledore last year."
Dumbledore's eye was twitching at the end of the song, while Ron was hanging his head, red with embarrassment. It had been that magic type of mistletoe that didn't let you go until you kissed.
"Whose next?" Dumbledore asked, in a near-growl.
"We are," the Weasley twins said together, "And we'll be singing…"