[ectocardia]

My flatmate tried to "compressed air" his laptop once using his lab's compressor. Didn't turn the laptop off. Only two fan blades survived.

We glued the other blades back on to tide him over until a replacement arrived, but each day one or two would break off and we'd have to give the laptop a good shake to expel them.

...it's often difficult to know how precise one must be when advising flatmates about compressed air.