The worst one I saw was on a PIK-DUB with FR. It's just a 25 minute hop, but some guy still decided to buy a panini. This had to be heated whilst service continued.

It was only on final, final approach - and after "seats for landing" - that the stewardess brought this guy his pannini... prompting an extremely stern "cabin crew SEATS NOW!" over the PA. I think she made it back to her seat literally seconds before landing.