One time I hooked up a reflux condenser outflow hose to a nitrogen manifold and blew mineral oil and water into a pressurized nitrogen tank. I only noticed when the reflux stopped and the water level moved down the column from the pressure of the gas. I thought it was hilarious, apparently it was not though. We suspended the 12,000 PSI cylinder upside down, let all the contaminants settle, and blew them out. The lines had to be boiled in some kind of solvent.
The experiment worked perfectly, as a matter of fact, I think my group had the best yield and purity on that synthesis. Inorganic chemistry was weird, but I made an A in the lab. Another time we lost a whole novel synthesis through our frit into a waste beaker. I couldn't help but chuckle, because that's bullshit, the molecule and its crystals were fucking enormous, but we got it on the second try. The chemical we used to wash the compound dissolved it.
Another time, I was tasked with making a chemistry short vid explaining a chemical phenomenon with the intent of providing it to high school teachers. My team did an explanation of fire and gas ionizations. How? Hydrogen balloons. Of course, being Central West Texas, the wind was blowing 15 mph and our match on a stick would not ignite the balloon. So, we climbed into a window well by the building's basement, where there was no wind. Apparently, the well focused and shaped the shockwave, which sent it up the side of the building, shaking windows. The video is just a match touching a balloon before a huge blast blows dust everywhere and the camera leaves my hand as I laugh maniacally.