1 {scene: The Vatican Library. A huge ball of stone is rolling along the hallway towards The Joneses and Dr Smith.}
1 Monty: Run!!! {they start running away from the stone ball, Prof. Jones carrying the book he took from the rack}
2 Prof. Jones: I must say, this rather gets the blood pumping!
3 Monty: You're enjoying this?!
4 Prof. Jones: I'm having a ball!

Of course this is inspired by the famous giant rolling stone ball scene from the opening of Raiders of the Lost Ark.

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2018-03-04 Rerun commentary: The book Professor Jones is carrying is a Monster Book of Monsters from one of the Harry Potter LEGO sets.

The giant stone ball is also a LEGO piece, in fact from the Indiana Jones Temple Escape set, where it represents, wait for it... the giant stone ball from the film!