i was driving to school the other day, and i had my jacket hanging on the back of the passinger seat. after i parked i went outside, grabbed my bag from the trunk...freezing cold, and i walked to the other side, grabbed the jacket from the back of the seat and WOW that thing was sooooo warm from the engine, and it was the best thing ever. just wanted to share, im sure we all know this but its just another god thing about the box