I did something similar.
Back when the Segway scooter (aka: Ginger) was only available via online auction, and the price was well over $100,000, I did a reply to all on an email I received.
Unfortunately, my hand must have bumped the "up arrow" key on my keyboard as I reached for the mouse, because it moved up one email and that's what I replied to.
So... I sent to everyone in my organizational group (including the Sr. Vice President)
"Hell... for $100,000, I'd toss your fat butt in a red wagon and haul you anywhere you wanted to go, up to 17 miles per day".
That was immediately followed up (once all the "out of office" replies came in making me realize what I'd just done) with the following email.
"Please disregard the previous message. My brain is on vacation.
If anyone needs me, I'll be under my desk in the fetal position for the rest of the day".
When the Sr. VP came over, pointed at me, and did the best Nelson Muntz "
HA-HA!" I've ever heard, I knew I was still employed.