Doh!

It was you that left it on by mistake (well kinda her faul too, she didn't realize it was on) Let's just blame it on the wife here, cuz you know she did not realize it lol.
Yep, told you women have a good tendicy (sp?) of doing that, when I was with my mom once, she had to set the e-brake on her vehicle once and told me to remind her to release it when we got back.
Most women usually think, "as long as it runs, it's ok," I'm sure A LOT of guys on here can't argue with that one. Also take Ray's advice, and check the brake fluid, it maybe boiled.