The Prince of Wales, on his 54th birthday, rides on an electrically-powered Segway.(Pual Lewis.Daily Mail.NPA Rota)

They say hype walks a fine line between gift and curse. While it can be great for advertisers to generate buzz surrounding the launch of a new product, oftentimes, too much build-up can backfire if expectations don't meet reality.

And while no amount of publicity was too much for, say, the Nintendo Wii, it's not common that something new to the marketplace can handle overwhelming exposure with such success. MSN takes a look back at some over-hyped products that memorably flopped, and the spectacular consequences that followed.

(*All figures in USD.)