Paypal (helped me) break my blog!
I'm guilty of breaking my comments/feedback submit. The PayPal donate button I had on the page was, in and of itself, a form. The ViewState and post-back bits on the rest of the pay were hopelessly confused as a result.
Stupid Blogger Tricks...
[Listening to: Kazauta - Kodo - The Best of Kodo (04:32)]