Hello, reality called and it wants its outraged indignation back. Seriously. Did you just miss the ENTIRE POINT of tumblr? This whole site is based on other people’s work!
Did YOU make that movie yourself? It would be much “fairer” if you gave credit to the ones who actually put the work into making that movie and I’m sure it also frustrates them when you make gifs from their copy-written footage.
Oh and if you don’t want someone to make your stuff funny, then do it yourself next time. Credit is given where credit is due.