I was held at checkin for an Economy Plus BA flight from San Diego to London and they asked for volunteers to get the next flight (same time the next day) and you would get $800 cash (prepaid credit card) and a hotel room for the night.

A few people took the offer, I didn't. As a result they denied me boarding and gave me the exact same deal, except it was a $1250 pre-paid credit card. I never expected to be quite so happy about not being allowed on a plane.