Scarlett Johansson and Jay Leno, The Tonight Show with Jay Leno Scarlett Johansson and Jay Leno, The Tonight Show with Jay Leno

If you think Scarlett Johansson is snotty, you're right.

The actress is auctioning off a used tissue on eBay on behalf of USA Harvest, a hunger-relief organization.

During her Wednesday appearance on The Tonight Show with Jay Leno (watch it here), Johansson revealed she was fighting a cold she caught from Spirit costar Samuel L. Jackson and figured the celebrity-to-celebrity exchange of bacteria was of great value. After honking into a Kleenex, she placed the mucus- and lipstick-stained tissue into a bag and autographed it.

"You got some lipstick and snot! We're feeding people and I'm clearing my sinuses," she said.

Bidding closes Monday. As of Friday morning, the Scar-tissue is at $2,205.

What do you think of ScarJo's dirty, but do-gooder deed? Is the tissue valuable or is it snot?