Google's Top 17 Easter Eggs, Gags, and Hoaxes By Tom Spring

Picasa's Mysterious Bear(s)
Google's free image editing and management software Picasa has a wild side that few people know about. Open Picasa and press Ctrl-Shift-Y, and a teddy bear will pop up. Keep pressing those keys and watch out for the sloth (or sleuth) of red-bowtied bears that take over the program.