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We did the same test in chemistry.
The teacher gave us little bottles of clear liquid and told us that each group could go home early as soon as they had correctly identified it. Everyone spent the afternoon diligently trying to apply whatever lessons we’d been learning for the last few weeks but no one got it.
At the end of the class the teacher gave us a bollocking and said we were all useless drones who just followed instructions without stopping to think. “I was hardly going to give you anything dangerous, was I... if only one of you idiots had just tasted it we could have all gone home an hour ago!”
Damned if you do, dammed if you don’t.
Same teacher also encouraged us to taste the almost pure ethanol we’d spent an afternoon distilling.
In science class we had to find out "what the liquid is" using various techniques that had been taught the previous year.
Now, the liquid was in 250ml old panda pop bottles, so it wasn't anything acidic, as they were stored in glass bottles.
We all got given a bottle and sent to our desks.
The 1st thing I did was taste it (I knew it wasn't anything volatile as we wouldn't be trusted since we blew a fish tank up with sodium(?), Put a little in water and it burns, we dumped loads in there)
Turns out the bottle of mystery liquid was salt water.
Someone convinced a pal to smell it, and then squeezed the bottle onto his face, he screamed and ran about like it was fire.
We all got taken aside and given a serious bollocking.
Even when I pointed out they hadn't made us wear any safety clothing, offered close supervision, or warned us not to get it on our skin, it just made it worse.