The stupid stuff we do at work...
Anaesthetic Machines have a basal flow of Oxygen whenever the machine is on, so you can't accidentally asphixiate someone!
Sometimes I accidentally leave a 2 Litre bag connected to the machine while this flow is on and the bags get quite big - like the start of the clip is one I left on today... SO, I decided to see how big they really go!
Of course, a team member punk'd me near the start...
That was a single use bag from a disposible circuit... I should try a high quality reusable one