This prediction was brutally contradicted by reality.
Tips
usage
Can be used transitively (something slaps your face) or intransitively (you get face-slapped). '打脸来得太快' (the face-slap came too fast) is used when someone is proven wrong almost immediately.
memory
Imagine someone making a bold claim, then reality walks up and slaps them across the face. That sharp sting of being publicly wrong — that's 打脸.