Ive heard various stories, the most recent one is when a girl wasnt really careful with her experiment and that thing exploded in her face. The entire Dept smelled horrible and some students were crying, but thank god she got only a few scratches (from glass??) and she's fine now
In previous years there were accidents with liquids... A student spilled something on her clothes and after a while she found out that the liquid caused a burn (or something like that) on where the liquid was spilled
Teachers advise students to wear old cloths when experimenting and of course wear that white robe (like doctors') that's made of cotton, I think. Also they tell them to drink a glass of milk after returning home from lab lessons