A dirty paper plate sold at an auction for $22,400 this week. Business Insider reports the plate was used by Kurt Cobain to eat pizza from before he wrote a Nirvana set list on it. California-based auction house Julien's Auctions estimated the plate's value at $1,000 to $2,000 before it sold for more than $22,000 on May 18. Julien's said the plate was used by Cobain at the 9:30 Club in Washington, DC, on April 23, 1990. The set list included "Love Buzz" and "About a Girl." The auctioned plate was accompanied by a signed letter of authenticity from Johnny Riggs, who performed before Nirvana at the 9:30 Club. Riggs kept the plate for three decades before selling it.