Or, very occasionally, they actually know it already
I had to sit through a whole day of electrical safety training one when I had a lot of real work to do. In fairness I did get a few interesting facts, but in terms of actually useful info aplicable to the job, nada, it ended up with us telling him which bits of the inside of a TV were safe to touch.

I should probably have had a better attitude, but it was very dull and utterly pointless and the man had the teaching skills of cardboard.
( CQ Knows the truth, all of it., Sat 17 Mar 2012, 12:46, Reply)