No, I haven't totally lost my mind - yet.  This is for real.  A guy has invented a bicycle made of CARDBOARD, and you can buy one for $20.00 if he has his way.

His name is Izhar Gafni, and professional engineers told him he was crazy, but according to and article on Technibob.com he's producing them for $9 each, and is trying hard to get them to market.  Here's what they look like
I was originally alerted about this through my all time favorite website, Geekygadgets.com . (Big surprise there, huh?)

Would you buy one of these?  Would you be afraid the thing would fold up while you were on it?  I would certainly not ride near a campfire, that's for sure.  But you have to give him credit.  And they say it couldn't be done!