The pickup truck one reminded me of something DF told me.
When he still lived in CA, he worked in construction. One day, he and a buddy/coworker of his had to go to a Lowe's type box store for some supplies.
As they were going into the store, an associate from the store noticed someone sneaking up to buddy's truck bed unlocked tool box, and told the guys about it. Buddy said not to worry about it. They walked up to associate and turned around to watch the fun unfold.
Would be thief walks along the bed of the truck, looking around. Without looking into the bed of the truck, he reaches over to the tool box. Much to his surprise, he was greeted by a very large, and not very amused Great Dane. DF tells me, the 3 of them stood there and laughed as would be thief took off running and didn't slow down all that much.