Whilst a first year student running a highly disreputable Reliant 3/25 van (bright orange, purple flashes & Kermit stickers), I was given a flashing orange beacon - as used by the construction industry and farmers. I installed it by drilling a hole in the roof vent and wired it into the interior light circuit. I was quite pleased with the mod. Until one of Leicestershire's finest pointed out that:
1) There was a height restriction for such lights and my van wasn't tall enough (who knew).
2) The handbrake on the car didn't work. Well I could have told him that - I had disconnected the cable to stop the, badly worn, brake mechanism locking on and binding the rear brakes.

I was let off with a caution. Lessons learnt:
1) Don't draw attention to your car unnecessarily
2) Prioritise proper maintenance over show

A short while later, I visited one of Dad's friends in Walsall who had a body shop. He was busy applying Starsky and Hutch white flashes to a Mk 3 Cortina - for a chap who had just got out of prison. Ho hum.