Never Use a standard -5degC to 105degC thermometer to record the Heat of dilution of Sulphuric Acid( diluting from Concentrated to 2 Molar) as the resulting sudden rise may shoot the end of the thermometer across the prep room and part the Hair of the Senior Technician 20 feet away like a small bullet, leaving said Senior Tech VERY unamused. This also applies to making Caustic Soda solutions ( My thats hot, I wonder HOW Hot?)
Never set a trap for the Junior Tech by connecting the handle of the door of the tea room to a VandeGraaf Generator on a dry Summers afternoon. The Senior Tech with the weak heart and the Pacemaker may arrive first and be somewhat startled by the 2ft long blue spark that leaps to his hand from said door handle. aid Senior may also be very displeased with you some hours later when he has recovered and is known for bearing a grudge.