Before popup blocking was a common browser feature, I developed a high level of skill manually blocking popups. I could zoom the mouse over a window and close it almost immediately after it appeared. This became second nature, and after getting used to it, I became incapable of not closing popups. Similarly, I subconsciously check "Do not show this message again" boxes and uncheck "show this message next time [x] starts" any time I see it. If this is what I'm missing out on, I'll deal with it.

(Submitted by Ben)