Our chemistry teacher did sodium in acid...... Sodium in oil in test tube, pour acid on top verrrry carefully, hold at arms length, then drop into a bin.
Then evacuate the chemistry lab due to clouds of choking white smoke.........
Also let us all do sodium in water, but seal conical flask with bung of cotton wool in case sodium jumps out. Slight flaw, sodium fizzes around a while producing hydrogen, so at the end there is a 'pop'... and 30 balls of flaming cotton wool fly across the lab, chaos ensues as the box of cotton wool sets afire and has to be quickly doused in the sink, etc. Health and safety..... er, what?