few more cases:
- you're launching someone's kite and while you still have it in hands he/she starts pulling on the bar hard powering it a lot
- you're barely managing a lightwind tack and someone drops a kite in front of you
- you keep coming back close to shore to do a nice jump/transition just to keep seeing someone hanging out with a kite parked static in the air, chatting
- you're coming back to shore tired (or grossly overpowered) to land but others are continuously coming out from that tiny launch spot
- someone else (besides several people you know well and trust) attempts to pump or roll your kite or rig/attach your lines
- when someone borrows your pump (and/or connect a different hose to it) and doesn't return it where it was
- when someone demoes your board you see them for no particular reason start readjusting straps
- when someone picks up or lands your kite and then moves with it in a way that you just see they move one of the lines over the wing and you end up with crossed lines
- when you see a knot on your line
- walking in/out and a line catches on some root or rock
- when you see someone with a cigarette is getting near your kite
- when you go on a quick downwinder with someone who spends 45 minutes to pump and rig
- you fail a frontroll and wipeout. Another dude stops, parks his kite so he's actually "in the way" to the board and checks on you "do you know how to bodydrag upwind?"
- someone starts correcting your launch technique "you should launch with kite towards water, it's safer that way"
- someone is riding in your wake as you approach shore and it's about time to be turning around