My car, actually. I had just installed 'headers' on my first car - a "muscle car" (sort-of). Doing this involved cutting part of the heater shroud which I sealed with duct tape. Worked fine for months, but eventually the heat of the engine compartment loosened the sticky stuff and no seal. I did not notice this at first,
as usually I drove with the windows down, but one long trip it was cold enough to have them up. I got drowsy, stopped for coffee and before heading back to the interstate checked my oil level, etc. *Then*, luckily, noticed the duct tape had come half-way off. Still don't know for sure that my drowsiness was caused by the CO or I was just naturally sleepy - it was late at night so that *might* have been the cause. I knew the passenger side header leaked a bit, though, and so _that_ theory could have been true, also. Anyway, it was a close call either way. I've heard of people silly/stupid enough to bar-be-cue indoors - sometimes it is their "last supper" in the worst way!
Rick " 1968 Camaro - man I loved that machine! " Jones