When you're on a diet / and someone brings in a cake
A Koala can't believe it post.
Koala Can't Believe It is a photo of a koala with wide eyes and an open mouth, frozen in shock. Captions describe moments of disbelief - a price tag, a plot twist, someone's terrible idea, the realization that it's already Monday again. The koala's stunned stare stands in for the face you make when your brain refuses to process what just happened. It's the meme for astonishment.