I have an awful singing voice.

I do. My wife tells me I don't, but I know myself -- I have a very limited vocal range and just shouldn't ever sing in public.

That rarely stops me from singing, of course. One of my favorite songs is Vance Joy's "Fire and Flood."

It's well outside my vocal range, but I belt it -- painfully -- anyway. It usually makes my wife laugh at me. Hard.

Anyway, Jimmy Fallon recently challenged some of his guests to sing Kelly Clarkson's "Since You Been Gone" -- a beloved anthem everyone knows but very few can actually sing well.

Featuring Shaq, John Oliver, Mumford & Sons, Meghan Trainor and more, some do alright. Others, like Shaq, don't. Shaq is awful. Shaq is me. I am Shaq. And it's hilariously painful.