Mine was buying a ton of shares of WAMU back in 2008 when the financial industry was melting down. I got in at $1.50, it popped up to around $3.50. I also bought in more on the way up, honestly thinking that they were going to make it. Come home one day from work to see the Google Finance headline saying that WaMu had been sold and I'm thinking cha-ching! Some big bank bought it for $6-7/share. Nope. FDIC took control and sold the assets to JPM.
So my mistake wasn't buying WaMu, it was not protecting my gains.
So my mistake wasn't buying WaMu, it was not protecting my gains.