Just for a word of encouragement, I did something similar after a century event last October where I left a pair of leg warmers, a nylon jacket, replete with cellphone in the pocket on top of my SUV...and like you, drove off not realizing they were still on top of my roof. Here's the good news...it is something you will NEVER ever do again...LOL. [I double and triple and even quadruple check outside my car now]. Still didn't keep me from leaving behind my cycling shoes at the house this last March headed out to another event. sigh...