Just does my head in, I see this sort of thing every day. Last week one of our machines at work had a warning alarm going off. One of the engineers at another of our depots found it fit to squirt a load of silicone into the alarm to shut it up.

I went to fix the fault properly, and found it was only a loose wire in a contact block, took me less than 2 minutes to find and fix, then about an hour to pick the sealant out of the alarm!!!