Sometime in the early 80's, consumer electronics 'giant' Tefal ran an ad campaign featuring a collection of scientists clad in white coats demonstrating various products they had supposedly developed. To show just how brainy they were they had really large heads, not rounder, just taller, with a hairline about a foot away from their eyes.

Sadly for several kids with larger than average foreheads in the lower years at our high school, this advertising campaign was more successful than Tefal could have possibly ever dreamed.

At random breaktimes for a whole year the cry "TEFAL!" would go up, after which everyone in hearing distance would tear after some poor first year, chasing him all round the school if necessary. When he was finally pinned in a corner, one of the older kids in front would pull out a Trevor Francis ruler, measure his forehead and then shout out the total, adding on at least 5 centimetres for effect. The surrounding mob would then chant "TEFAL!, TEFAL!, TEFAL!" until breaktime finished, a teacher broke it up or the 'Tefal' cried too much, whichever came first. Looking back, the whole scene was like something out of 'Invasion of the Body Snatchers'.

My friend and I happened across a man bearing a particularly generous frontsipiece. We immediately seized the opportunity to play "tefal" (take turns to shout "tefal" with increasing volume). To our horror he approached us and calmly confessed that yes, he was the man from Tefal ads, which had led to a part in the TV drama "Tripods".
We got his autograph.