We've caught a lot of flak for our TV-B-Gone CES prank from two years ago. This year, we decided to focus on the press instead of the exhibitors.
We bought our fellow exhausted scribes free pizza! Because really, CES sucks the life out of you, we're all in this together and everybody loves pizza.
So yeah, it wasn't quite a prank, but a CES worker did get pretty ticked off at me and threaten to kick us out after taking my name down. Then she disappeared on the phone into an office, where I assume someone sensible told her you can't kick someone out of a trade show for buying people pizza.