The whodunnit was very anti-climatic.
Me: *opens cupboard, no tuna*
Me: [to flatmate] Dude, that was my tuna!
Flatmate: Oops! I'll find it. *goes through bags* Damn, it's in one of the boxes. I'll bring it back to you tomorrow.
Would have been much more fun if she'd been all, 'What tuna? I didn't see any tuna. You sure you didn't imagine it? Maybe the cat took it?' And then I would have had to follow the clues and discreetly search through all the boxes until I found all four cans of it and confront her with it until she was all, 'Okay! I admit it! I stole the tuna!' And then she had to be taken away in handcuffs, as the tuna-thief that she is.