How often do you guys mess up during labs?

I set my desk on fire and left before it was out. They found me eating lunch.

Didn't know catholic schools teach chemistry lab

>university gen chem lab
>have to make silver compound or some shit
>everything is literally going too well
>last step is to add acetone the final product and heat*
>heat it like anything else ive ever done
>final product shoots out the 10cc test tube
>look again at the instructions
>*heat very slowly or else you'll lose your final product as it'll shoot out of your test tube
>lab professor took pity on me and gave me a C+

I've never been so fucking pissed in my life.

Never, I dont do labs since I swiched to mathematics
There was a guy at chem who made a volcano of a boiling acid chrome solution.
that was pretty neato

>spilling shit on the floor for no fucking reason

everyone fucks up, even pros. What matters if how good you are at troubleshooting shit really. Havnt broken glass in like 4 years though, feels good man.

>finish experiment which requires liquid nitrogen
>throw excess liquid nitrogen on the floor
best thing ever. that and breaking glass on purpose throwing it into glass waste bins, especially test tubes

>doing hydrolysis of silicones experiment
>starting reagent is Trimethylsilyl chloride
>dont read the COSHH that says under no circumstances handle it without gloves or a fumehood
>open that naughty bottle up, standing pretty far away
>take a (luckily) tiny breath in the vicinity and then suddenly
>FUCK ME AAAAAAAAAAAAAAAAAA
>smells of the worst pain ive experienced, hydrolysis into HCl in your lungs, all that good shit

read the COSHH, lads

Chem students are losers

>Doing restriction enzyme cuts
>adding a billion different reagents in minute amounts
>forget if I added something already or not
>start over
countless times