It's quite old but popped up on my FB recently.
Grandparents are filmed being presented with a second baby that they didn't know about. They were there with the son & daughter after the birth of what they thought was one baby. Then the son comes into the room with another baby and says (not literally) "Surprise ... we had twins!"
AIBU to think this is really really ODD behaviour by the parents? The comments under the video are full of people criticising the Grandma for being shocked. Wtf do they think they would do if they had been pranked like this?