Weird Al Yankovic boasted about his invitation to see inside the Pixar campus this morning on his Twitter feed.

Lee Unkrich and Weird Al bumped into each other at some point during his visit. Lee posted this photo as proof.

Naturally, his visit has caused a flurry of speculation online as to what, exactly, he was doing there. If he was lending his voice to a future Pixar character, it's unlikely it would appear in any films earlier than Monsters University, as Brave is surely finished with its primary vocal work at this point.

Also likely, is that he's there just as a curious celebrity to have a peek.

For the benefit of the charity Give Kids the World, Lee Unkrich and Darla Anderson, Toy Story 3 director and producer, respectively, have offered a signed Toy Story 3 poster for auction on eBay. Bidding ends this Friday at 6pm PST.

From their website: "Give Kids the World is a 70-acre, nonprofit "storybook" resort, located near Central Florida's most beloved attractions, where children with life-threatening illnesses and their families are treated to weeklong, cost-free fantasy vacations."