One of my pet peeves....
I get rather annoyed when someone asks the same thing to a whole bunch of people in the hopes of ensuring a timely response. Then several people work dilligently to come up with an answer thereby duplicating or triplicating each other. The two examples I can think of right now are...
1. I worked hard researching certain cell phone modification specifications for a poster on an electronics forum only to find that the person had plastered the same question across every board he/she could find.
2. I have a person at work who emails several people to find out the answer to a question. Each person thinks they are being personally tasked. It is quite offputting after spending several hours working on the issue to see that someone else who was given the exact assignment has posted the results 15 minutes earlier.
It is hard to stop because often you don't know the person is doing it until after you have done the work to help them out.
I'm sure this has never, ever happened to anyone here.