On my way out of the Tower of London, I came across a small group of actors in period garb putting on… some kind of performance. I stopped and listened. As they were leaving the first scene, under this tree, I muttered a Holy Grail line under my breath vaguely directed at this guy; he smirked, then chuckled, then quoted one back. I was in.
I wound up following this group across the Tower, watching them put on a show, eventually bringing everyone out onto the lawn culminating in a duel for the hand of a princess, this guy sneaking in Monty Python quotes along the way.