She once trolled a group of tourists who didn't recognize her.

Maybe she's stony-faced in most photos, but the queen really does have a fun side. One of the queen's former security guards recalled a time when a group of tourists at Balmoral Estate didn't recognize the monarch, who was wearing a head scarf at the time.

The group asked Elizabeth if they had ever met the queen. 

"No," Elizabeth allegedly responded. Then she pointed to a nearby policeman and said, "But he has."