Years ago I took a girl I met out for a lunch date. She lit up a cig, and i asked her not to smoke in the car so she tossed it out the window. Cool... After lunch we get in the car and I was shocked at how strong the cig smell was for just a few puffs. Later I found out why. It had blown back in the window, landed on the rear floor (carpet) and slowly burned itself all the way down, with the windows up and doors locked. Lucky it didn't catch on fire. The date didn't work out either lol. (I posted this on the comments)