I had a car that smelled like a decomposing body. Turned out to just be regurgitated ranch sauce and tequila from Wild Wing Cafe. Tip: If you are driving faster than 65 and puke out the window of a car, it comes back in.
I had a roommate in college that did that shit. I couldn't ride in his car for 6 months cause you DON'T get that smell out. I was like, no I'll drive. That nasty bastard was known to spew. One day, I came in all pissed at him about something and I was ready to read him the riot act. He was kicked back on the sofa and I walked in and proceeded to rip him a new one about whatever it was. I noticed he never said a word and never looked at me once. As soon as I finished, Mt. Spewvious erupted. Sumbitch had been drankin' all day.