Possible Clues:

• Get ready to drive him, perhaps. What a giggle!
• A giggle or titter
• Dainty laugh
• Some amusement cummings, having grown up, instilled in you
• Giggling sounds
• Polite little laugh
• Get ready to drive him, perhaps - that's a giggle
• Prepare to drive him, perhaps. That's a giggle
• "That's mildly amusing!"
• Drive him off, by the sound of it, just for a giggle