Strange, Weeble-shaped glasses used in school canteens that seemed to be made of solid diamond. Their real purpose was to prove who was bestest at the table. Every Duralex glass had a a two-digit numbers on the bottom - so whoever had the highest number on their glass was clearly the bestest.

Unacceptable behaviours included:
- Trying to convince anyone that low scores were best, like Top of the Pops, or Golf
- Turning your glass upside-down to make your number higher
- Declining to play

It's only now I realise they're name is aa bit like the famous brand of sponkies. Dunno how we missed that at the time.