Have a look and reflect on this example of poor sportsmanship... although, if you have fished for any length of time you may have had a similar experience.
There are some rules on good etiquette that most anglers know; while in many cases they aren't written down anywhere you just know intrinsically what they are. In this case a guy casting over your line and messing with your gear and setup is just unacceptable.
Rules like: Don't fish the same small pool if an angler is already there, and if you want to at least ask him if you can work in. Don't leave garbage and bait cups behind and always, always, ask land permission for private property access.
Unfortunately, in far too many cases I have seen these rules ignored and what can happen is we all get painted with the same brush; which can have a negative impact on all anglers.
This video was a good reminder to watch my "Ps and Qs" and not ruin another guy's outing.