Well, there's a Stupid Human Trick we haven't seen before.

"Beefcake" action hero Bruce Willis livened up the Oct. 4 episode of "Late Show with David Letterman" by donning a raw meat hairpiece inspired by Lady Gaga's straight-from-the-butcher VMA dress.

Balancing the meaty toupee on his bald head, Willis told the host that his "all-natural" do was made of 100 percent ground beef sirloin -- and even offered a few handy hair care tips.

"Later, rinse, repeat, tenderize," he quipped. "You've got to give it a little love with A.1."

But if you thought the idea of a "tainted meat hairpiece" was stomach-churning, get those barf bags ready. The fragrance spokesman next pulled out a fork and some salt and pepper and invited Letterman to "dig in, buddy."

And he did -- just before dashing backstage to spit out the nasty bite. Not that we blame him.

It's not the first time Gaga's soon-to-be-jerky creation has inspired a late-night talk show guest. Kate Walsh hit up Leno last month wearing a dress covered in sushi... but at least that's supposed to be raw.

Man. We're going to have to come up with a new Halloween costume!

Meanwhile, check out Jeremy Scott's prosciutto dresses.