Indulge me here... This hs nothing to do with smoking while driving, but it's one of the funniest things that I ever saw.

When I had my flight school one of my instructors come in with his buddy and check out a plane. They said they were going to do some mountain flying and did all the required preflight checks for flying over the Rockies. They took off and came back about 45 minutes later literally covered in ashes on their hair, face and clothes.. Turns out that the instructor's buddy had his dad's ashes and wanted to scatter them over the Rockies. They slowed to about 90 Kts, opened the window and attempted to dump the ashes. We spent almost a whole day getting the old man out of the plane.