I have noticed the last two gifs I have seen here on Meta are static images. It caused the animation to be a single frame, and thus create some very funny but also very disturbing freeze-face reactions.
I’m running the latest stable Chrome and turned off all extensions to eliminate variables specific to my ux. Still the same behavior.
On further page-sourcing, I notice Sully is a png but sausage-slap lady is a gif, yet no animation (I am guessing animation was the intention; the ReplyGIF thread’s context is a big tipoff that an animated gif was implied to actually be there.)