I'm sure we all have little irrational niggles we could share... Mine is like this. You're riding along a bike/pedestrian path, like the riverside path in York, and you're coming up to a family walking ahead of you, or towards you. Either they see you, or you ping your bell to warn them. Now, all I want is for them to create enough room for me to get through safely - and I'm rarely going very fast. Just keep walking, but bunch up or move over so I can pass. What do I hate? When they leap out of your way, gather all their various children about them, and insist on standing still, while you pass. Makes me feel like I've disrupted their walk or they think I'm going to mow them down, when all I wanted to do was make sure none of them actually step in front of me. I know, it's the tiniest little irritation. But I bet you can all come up with something pettier!