giving the car a pat when it's got to its destination in one piece....
I thought I was weird and possibly the only one doing that! ;-). Never told anyone before but I always do it, did it on my bikes and it goes back to my childhood when my dad would tap the dash top of his Ford Y model at the end of the day and say 'Thanks Bess'. He said one day that it was in relief that it actually got us home, it was only an old banger but we would leave Birmingham and have Sunday's at the coast in that old car. In his latter years I asked him how this was possible, had I imagined it and he laughed and said we set off in the very early hours and got back very late.
