Before You Go Go
Here's a fun gift for any Londoners out there: Wake Me Up At are a set of stickers that you slap on to yourself when you stumble onto the subway (or "the tube" if you prefer) in a drunken stupor. The stickers advise your friendly fellow subway riders to kindly wake you at a designated stop. Sure, it's an invitation for a mugging, but have faith in ye fellow man!
My favorite part of the instruction sheet is Step 4: Dream of juicy kebobs. WTF?