A purchase from my bloody beginnings. My thoughts at the time were something like this: "TUI = big = good company" and "share has fallen a lot --> lots of upside potential".
Then one thing led to another, of course TUI fell even further and I also missed redeeming my subscription rights from the share split because I was frustrated at the time and hadn't looked at the portfolio for a while.
The result of all this: A loss of a comfortable 81% (not shown correctly here)
The real loss was quite low but it still hurt.
Learning from the whole thing: Just because a stock has been high before doesn't mean it has the potential to get back to the old level... And, of course, that you should also keep up to date with the stocks in your portfolio...