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?