1 Prof. Jones: {walking through the open hotel room door} Voilà! Dr Smith's room! Ooh, a mini-bar...
2 Monty: Now if we can just find the orichalcum. Aha, there's a safe!
3 Monty: {examining the safe} It's pretty flimsy. I can probably pry it open.
4 Monty: I need a screwdriver.
4 Prof. Jones: {by the mini-bar} Well there's plenty of vodka, but unfortunately no orange juice.

A screwdriver is a cocktail made from vodka and orange juice. Just in case you're going, "huh?"

Also, I realise that a hotel in Kiev in the 1930s is unlikely to have either a personal safe in the room or a mini-bar, but hey.

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2015-01-02 Rerun commentary: This is one of my own all-time favourite gags from the comic. I don't know if it's the favourite, but it's certainly up there in the top ten somewhere.

The fact that they're in Ukraine, where you'd expect plenty of vodka, just makes it all the better. The confluence of events here was just perfect.