Sharpie pens.
UGH.
Constantly.
Oh, and the rubber cement we had in school.
And the art fixative spray.
The one day everyone left class stoned due to the teacher using fixative spray until there was a haze in the room.
Yummy.
*blarf*
We made ammonia gas and phosgene in chemistry class. Good thing phosgene is heavier than air.
I grew up in a body shop. In the Winter it was too cold to open up windows for ventilation. Doing a lacquer job on a full size care would leave you walking about an inch off the ground when you left the paint stall.
WE had all of those.
Plus mimeograph fluid...
In my high school the chemistry lab was on the second floor. Above the math class room. With the plumbing for the lab tables penetrating the floor slab (or ceiling slab depending on the altitude from which you were viewing the situation) through neat seemingly core-drilled holes that left sufficient clearance to pass various items, e.g. latex hoses through to the far side (before Gary Larson)...
There in lies a tale..