The Motorola Razr made the fastest trip from being cool to being uncool of any gadget I can think of. I feel for the designer. They made something insanely cool and desirable, and as such, almost everybody got one, robbing it of its coolness and desirability.
I never had a Razr, but I did have a Motorola Pebl, which is interesting in that it’s the exact same phone while being the total opposite phone. It had pretty much the same internal guts as the Razr, but instead of being impossibly thin and shiny, it was a rounded matte black lump.