Thank you Butcher_Of_Hope for making this gif.
Stashed in: gifs, SPOILER ALERT!, High Quality gifs, @karengillan2, Butcher_Of_Hope
The spoilers GIF is from the episode "The Pandorica Opens", about 9:30 into the episode.
It's the first of a two parter; second part is called "The Big Bang". From season 5.
Thank you The_Love_Child for this gif.