My players are battling against a secret organization, a real political/social intrigue story. The thing is, the bad guys are smart too. Each of their members with decently important information is tattooed with an arcane glyph that goes off if they reveal important secrets(or have the intent to)-- killing them. Kind of a cyanide pill to prevent leaked information.
One of my players thought of this, and I hinted that it might be the case. They proceeded, unbeknownst to me, to craft an absolutely brilliant plan. I was informed of the idea just hours before the session and was very impressed.
Here's the thing: they captured a bad guy, and when they went to go interrogate him... polymorphed him into a rat. Rat form means no glyph, no glyph means he doesn't die. But how do you interrogate a rat?
And that's when they cast Speak with Animals. Completely circumventing the cyanide pill, allowing them to interrogate fully. An incredibly genius move, and one they pulled off excellently. I'm so impressed.
They got a ton of useful information, and honestly they deserve some extra XP(milestone XP at least) for that move.
Anyway, just wanted to share.