You see a shoe in the middle of the road and think:
Maybe I should go back and make sure someone hasn't been hit by a car and is lying in the ditch waiting to be rescued
You spit your gum out the window and think:
I sure hope that doesn't end up being some kind of crime scene. They will find my gum and I will be a prime suspect!
You are cooking dinner and pour blood from the meat down the sink and think:
If I disappear today they will find that blood and think I was murdered. But then they will take it to the lab and figure out it is just bovine blood.
Yes, I have really thought all of these things. :D