During the celebration of her 70 years of reign this summer, the queen’s former bodyguard Richard “Dick” Griffin told Sky News about a hilarious encounter Elizabeth had with two Americans while hiking in the hills near her castle in Scotland.

The hikers struck up a conversation, and it was immediately clear they didn’t recognize that they were talking to Queen Elizabeth. They told her about where they had traveled around Britain, and then one gentleman asked her where she lived.

“Well, I live in London but I’ve got a holiday home just on the other side of the hills,” the queen responded. She told them she’d been coming to the area since she was a little girl, for over 80 years.

The man said if she’d been coming there for 80 years, she must have met the queen at some point. Her response was perfectly quick-witted.

“Well I haven’t, but Dick here meets her regularly,” she said, gesturing to Griffin.

Griffin’s response was equally hilarious, playing along with her and never letting the hikers know that they were shooting the breeze with the queen herself.

They only found out when they later showed a photograph to another person.