Our party was getting out of hand. Five naked computer scientist rugby players high on drugs had squeezed into the bath off the spare bedroom – just at the point that I was showing MB’s nonagenarian mother to her room for the night. This was after causing havoc earlier in the evening by hacking into our two MacBook Airs.

They weren’t the only problem. Some parents had commandeered the spare bedroom itself as a nursery. It was crawling with toddlers, and a young mother was even changing a baby’s nappy on the bed.

This was no place for an elderly guest to stay the night.