I returned my Samsung Vibrant due to the poor GPS, and decided that I would buy the Nexus One - the phone I had lusted over for the majority of the year - on the very next day. I left my iPhone in the dust, and had no intentions of going back.
"That settles it! I'm buying the Nexus One the second I wake up in the morning!"
Well, that following morning, Google took the Nexus One order page down forever. Not owning an official Google Phone has been one of the biggest regrets of my nerd life.