So, online poker is legal in Germany, but (I don't actually know this but I strongly assume it's the case), there was a regulation passed that poker rooms had to include various safety warnings.
As a result, there is a 'ban yourself from gaming for 24 hours' button on pokerstars.
By itself, this may be a good idea. It probably is. But what is not a good idea is making this button work immediately, without asking for confirmation, without being reversible, and then putting it on top of every opened table next to the 'add chips' button.
Maybe asking for confirmation is not desirable because you don't want to give people the opportunity to think twice about it. If that's the problem, how about requiring a double click? Or at least, dunno, not putting it immediately next to a button that you need to click regularly?
(Yes, I clicked on it by accident. The 24 hour period is just about to run out.)
I'm kind of lucky that it happened in cash games. Had I been playing tournaments, it would have booted me from all of them, and in effect cost me financially.