Comment by adhksafds

Here's one of my favorites from my desktop support days. A frequent flying calls in one day to report that her keyboard is broken. Diagnostic questions indicate that it keeps entering spaces all on its own.

I bring a replacement but first sit town and test-drive it without any issue, to her surprise. Next, I watch her type. Now, this user happens to be a rather large woman, working at a somewhat cramped desk. After typing for a bit, she exclaims, "See, it's doing it again!" Sure enough, spaces are appearing in her word processor, and her thumbs are not pushing the spacebar. Her breasts, however, are. I delicately explained to her that she is "leaning" on the keyboard. By rearranging her desk and seat, the problem was happily solved.

Probably the most apt PEBKAC I've witnessed.