There was a bloke on here a while back who panic sold all his BTC at 400 as the money was meant for his honeymoon, and he had lost a lot.
People commiserated with him for having to sell at the bottom of the market (at the time).
Seems like quite a good price nowadays.

It's all relative. Some one who panic sold at $1,000 in December 2013 would now be an investment hero, being able to buy back three times as many coins as they sold, as the value of the dollar has gone through the roof (in BTC terms).

But then someone who panic sold a few months before at $100 would look like a right muppet.