If you left your seat in Miss Windsor's biology class for GCSEs at Wimbledon College, you'd return to find a laboratory implement placed on your stool and a crowd of people screaming that you'd been sitting on that for the lesson, thus getting bum pleasure.

The progression was as follows:
1. Pencils
2. A test tube
3. A test tube rack
4. A bunsen burner (yellow flame)
5. A bunsen burner (blue flame)
6. Retort stand
7. Upturned stool, signifying '4 pronged pleasure'.

We thought this was the pinnacle of implied but unsubstantiated cornhole abuse, until Gettings returned to his chair to discover that he had in fact been sitting on Adrian all lesson, and Adrian was crying.