Being scared by ninja runners. When you’re on a peaceful jog and the music blaring through your headphones sucks you into your own little world, you completely forget about your surroundings. So when a ninja runner sneaks up on you and you catch a glimpse of them in your peripherals at the very last second, our natural reaction is to jump in fear – maybe even strike a karate-esque pose. We’ll feel humiliated when we discover that we’re not actually being attacked, and the alleged killer continues running past us. However it is a relief to know that our reaction speed isn’t too shabby.