Speaking of people talking too fast, many young people at fast food joints or really anywhere they work, seem to always talk like they're on speeders (amphetamines). I tell them to slow down, it's not a race and that my ears don't listen as fast as they used to. Actually, I'm deaf in my left ear, and background noise makes it hard to sort out a voice in a noisy environment.
Back when I was flying, on a few occasions I would have to tell ATC personnel to slow down the speed and you'll only have to repeat the clearance once.