TigerFeet it was a dinner party that the OP was invited to with very posh/rich hosts. Dinner consisted of tinned soup, mac n cheese and cheap ice-cream, along with unexplained fits of giggles, odd conversation and a pinched bottom.
It transpired over the course of the thread that the couple were rather eccentric in other ways - donating a bottle of turps to a school tombola, for example.
After much egging on, the OP invited them to hers for a dinner party and vowed to make it equally as eccentric. She chickened out of a weird menu, but procured a cuckoo clock for the occasion along with other little touches. Her husband got into the spirit of things by wandering around, pre-dinner with a packet of crisps, uttering the now immortal words 'pombear, anyone?'
Hence the pombear references all over the place.
It was sort of amusing, but for some reason has taken off in a huge way, like some things do.
HTH. The original is now in classics, but is rather long.