While being extremely bored and in possesion of a large lump of chalk, I, as a driver in a convoy of British Army vehicles carrying Medium Girder Bridge (the armys version of a meccano set) decided to give my truck white wall tyres.
I also added "HM Queen & Sons" to the side, and "Stop Me And Build One" to the rear.
The Royal Engineer officer to whom we delivered the load was not best pleased!
My lads loved it :-)