An apocryphal one
BAck in the days of mainframes with green screen terminals - ICL as it happens, lots of mates worked there.
User routinely complained that her keyboard added spurious spaces. Numerous engineers failed to find anything wrong.
Last chap walked in, looked at her sitting at the desk, and said "why don't you get a cup of tea while I look at it."
As soon as she was out of sight, he wound her chair up a couple of inches.
Problem solved: she was short and well-endowed. Observation is the key to good outcomes!