The DM that dares take something right out of the players' pockets without a chance to get it back or take out their rage on a suitable scapegoat had best beware. You know what they say, possession is nine-tenths of the player's motivation, or something like that. Transcript:
SFX: (BASH) Rainbow Dash: Pull over! Applejack: How about no! Listen, fellas, I'll pay you double to outrun them. DM: The drivers like the sound of that, and they start to speed up. Twilight Sparkle: Wait, won't Applejack's player be mad if she comes back and a bunch of her money is gone? (silence) (cart slows down)