YouTube legends The Royal Stampede are best known for their hilarious horror and thug pranks. But in this excellent new video, they’re trying something a little different. One of them leaves his elderly grandpa with unsuspecting members of the public, saying he won’t be gone long. After a short while, the old timer decides he wants to get up and walk around a bit. But then he does something incredible that totally blows everyone’s minds. Check it out.