The point of this post is so people can comment with their own or ask for someone to make some for them or SOMETHING. Anything, really.
I use Ezgif to make them and basically it's super simple: find two gifs you want to merge, upload them, let the website resize them and voila! (Sometimes it might help to make them both black-and-white or sepia just to make it look smoother.)
ETA: Please note 'nsfw' in the title of any comments if it is, in fact, not safe for work!
( gifs ahoy )