My Mum's birthday happens to fall on April 1st, and she is a big wine buff, specifically Champagne. She has hundreds of rare, expensive and in some cases irreplaceable, bottles in the cellar.
So one year my brother and I decided to remove every bottle from the cellar (we moved them into another dark, air conditioned room) and made it look like it had been ransacked, tipped over boxes etc, the door ajar.
She kept asking me to pick a wine for dinner, and wouldn't go downstairs, eventually I convinced her that I didn't know what to get and she should go down. It's a good thing I followed her, because she nearly had a heart attack when she got there!
I'll try to post some photos of the empty room, and the stash room later.
I reminded her of the date and she said she was kidding. She was! Right? 
