It was on this very same tour back in 1973 that the Who experienced one of its strangest onstage moments. A fan from the audience actually filled in for an "incapacitated" band member during a performance. In honor of this unlikely substitution, we've assembled a list of the five greatest fan fill-ins of all time, those rare moments when an audience member goes from being an average chump to a rock god in the blink of an eye.

One

can only assume that a rock star of Tommy Lee's status would lead a

so-called "destructive" lifestyle. So you can imagine how much of a

shock it was to everyone in Alberta, Canada, when the Mötley Crüe

drummer bailed on a show due to something as lame as tendonitis. 

Lucky

for the fans, a local drummer named Harvey Warren stepped up to fill the

void. A Starbucks manager by day and stick-wielding timekeeper of a Mötley Crüe tribute band by night, Warren turned out to have some pretty

decent rock chops, delivering a spot-on impersonation of Tommy Lee that

didn't miss a beat. And yes, he even got to man the legendary "boobie"

cam. 

On

March 1, 2012, a fresh-from-jail Lil Wayne was scheduled to appear on

an episode of Jimmy Kimmel Live! The only problem? Weezy never showed. 

So in the true spirit of show business, Kimmel called up a random dude

from the audience to fill in for the multiplatinum rapper. The audience

member, a gentle giant named Carl who couldn't have known less about

Lil Wayne if he tried, was interviewed by Kimmel as if he were the real

deal, fielding questions about Weezy's criminal record ("got locked up

for speeding"), his favorite sports ("hockey"), and what he did in

prison to pass the time ("read To Kill a Mockingbird"). 

Every

mom loves to brag about how talented her children are. But this crazy

mom takes the cake. 

Back in 2010, a mother at a Michael Bublé concert shoved

her way to the front of the stage and demanded that the Canadian lounge

lizard sing a duet with her son, Sam, who had just turned 15. But

rather than telling the mom to piss off -- like any sensible person

would -- Bublé decided to bring the kid on stage and give him a shot. As

it turned out, this Sam dude could actually sing, and Bublé's response

upon discovering this -- "Holy shitballs, Mom!" -- is worth watching in itself. 

It

was, by all accounts, a typical U2 concert. In 2011, after a show at

Nashville's Vanderbilt Stadium, the band had just finished playing its

usual set-closer "Moment of Surrender" and was heading for the tour bus.

But then Bono made an unexpected trip to the front of the stage to have

a chat with a fan in the front row. 

The fan he was talking to? A guy

named Adam Bevell, who for the entire show, had been holding a sign that

read "Blind Guitar Player, Bring Me Up!!" Well, bring him up they did,

and within seconds, Bevell was onstage with an electric guitar strapped

around his neck. He then led the band in a touching rendition of "All I

Want Is You," which he dedicated to his wife. This, according to our calculations, is the marital equivalent of giving your spouse 1

million foot massages.  

In

honor of the Who kicking off its first North American tour in four years, we've decided to give the

number-one spot to Keith Moon, whose fame as a drummer for the Who was

rivaled only by his reputation for flushing industrial-strength

explosives down hotel toilets. 

During this particular episode in 1973,

Moon had consumed more than his usual number of

horse-tranquilizer-and-brandy cocktails, passing out onto his drums in

middle of the first set. As if this kind of thing happened on a regular

basis, guitarist Pete Townshend then took to the microphone and asked if

anyone in the audience knew how to play drums. "Preferably," Townshend

said, "somebody good." 

When a 19-year-old named Scott Halpin

volunteered, Townshend brought him up onstage, and the young drummer

from Iowa managed to hold his own until the end of the show. Halpin's

performance remains legendary in amateur drumming circles, and it even

won him a "Pick-Up Player of the Year Award" from Rolling Stone. As far

as we can tell, Halpin is the only person to receive this award -- ever.