Ever get the feeling that someone is watching you, but you’re not sure? Try yawning and then glancing at your suspected stalker. If they yawn, then you know they’ve been watching you, since yawning is contagious.

1. Ever get the feeling that someone is watching you, but you’re not sure? Try yawning and then glancing at your suspected stalker. If they yawn, then you know they’ve been watching you, since yawning is contagious.