Scarlett Johansson is giving through the nose to USA Harvest…for real! She and Jay Leno are auctioning off the tissue she blew her nose into on the Tonight Show on eBay, with all the proceeds going to the food charity. ScarJo says her cold had "value" because she caught it from her Spirit co-star Samuel L. Jackson. There are some real wannabe sick-os in the world -- the bids have already surpassed $2,000!

We're all for giving back to charity, but eww -- not like this!