Less than a year ago I bought a Vauxhall Corsa, 2nd-hand but the latest of the 3 'facelifts', still well outnumbered in the UK by the older versions. Its 'aqua' colour, a light pearly green or blue according to the beholder, was sufficiently unusual that I'd never noticed it before, although it's gradually becoming more common. (The log book describes it as 'silver', which it is - at night under sodium lights!)
About 3 months ago, as I came up to a local 3-way mini-roundabout, an identical model and colour car reached it from each of the other two roads simultaneously. Trivial, but amusing.
As my car is 2nd-hand and originally from a different part of the UK, the 3 cars involved couldn't all have been due to a local 'dealer-cluster'.