The Mack truck
Also for a LONG time, there was a conglomeration of local and long distance trucking companies (about 4-5 different companies operating under roughly the same management) that I passed on my way to my wife's house before we got married.
I'd also see their trucks all over the place.
Despite the ownership and the lettering that was on them, they were all white late 90's mack with a tandem stripe in red/blue..
...except one day I drove by their yard and in the sea of about 50 of those nearly identical tractors, sticking out like a sore thumb was ONE purple one.
Same model, same options. All parked in perfect formation. 49 white with red and blue stripe, ONE purple.
I wish I had a picture of that.