Flash

I just started up Pandora, Tom Waits was playing, and I was interested in the song, so I googled it. When the first site I clicked loaded, it popped up a Flash based box asking me to sign in, which is aggravating enough; I don't care about your crappy site and I'm not signing up/in. More to the point, I closed the dialog box, which then crashed Flash, and thus Pandora. Great.

This is why I support Steve Jobs' position on Flash; it can't die quickly enough.