Chemistry practicals

One of the most fucked up lessons of all. Chemistry practicals. It's basically cos my chemistry class consists of finely selected retarded individuals (me included) who fucks up absolutely everything.

Here's one story:
Lately, we been using this apparatus which filters water from a solution. It needs to be connected to a vacuum tap to suck the water away (with the orange rubber tube).

The man in action. 

Well, this guy connected it to the tap, turned it to the fullest and he heard a noise (like air escaping) but nothing happened. The water didn't get filtered off so he asked, ''why isn't this working?''. I thought he was just being a stupid monkey so I told him to let it wait a bit.

After like 10 minutes, still nothing happened but the whole room was smelling like stinking gas. Turned out he connected it to the gas tap instead of the vacuum tap. At that time, the everyone was fucking dying and the teacher ran over saying, ''Are you trying to gas the whole class??!''.

I got the biggest laughing spasm ever in the most inappropriate situation :3

The 2 taps were right next to each other, except one said GAS and the other said VAC... 

Swear down, if I was a stupid chav and wanted a little spliff in the middle of the lesson, the whole room would have blown up.
So since then, every lesson, we just take every drop of piss out of this certain guy XD
Ok, fine... only I do cos I'm such an immature bastard enit