Thinking Fast In The Slow Lane

(My dad is well known for suffering from road rage and he has a particularly slow moving car in
front of him. I am in the passenger seat, and very young.)

Dad: *shouting* “Come on, come on, get a move on, for heaven’s sake! If you we’re
going any slower you’d be going in reverse!”

Me: *confused* “You appear to be confusing speed with velocity.”