actually kinda like the idea for a thread - it would become a library of tricks that have gone down. you should find a video-to-gif tool online that doesn't inject watermarks and then edit the URL into your first post for others to see.
https://giphy.com/ has one, but they just recently made it so that you have to create an account to use it.
here is the first one i found that produces them with no watemark after a quick search (
https://gifrun.com/). it looks as though it produces them with less frames, however, so another one would probably be ideal. example:
edit: imgur has one too but it looks like it has been having troubles off and on with youtube url's
https://imgur.com/vidgif