Here are a few funny responses you can use:
- "Only if you promise not to tell my mom!"
- "I swear I was just about to say something profound... like 'Bananas are fruit!'"
- "Swear like an oath? Or swear like a sailor? Because I only have one pair of flip-flops."
- "Sure, but I’ll need a swear jar. We’re gonna make some serious cash!"
- "I swear I'm not the one eating all the cookies... oh wait, that was me."
Feel free to tweak these to match your personality or relationship with the person!