When 20-month-old Leon discovered what his eyebrows could do, his father, Lucas MacEochaidh, pulled out his phone and caught the little one’s reaction on camera. Lucas says, “He was laughing hysterically and had actually slowed down a bit by the time I got the camera out.” In just three days MacEochaidh’s video of baby Leon playing with his eyebrows has been seen more than 500,000 times.