are you sure you're sure

phrase1

1. •
   (humorous) A way to ask if someone is certain about something.

   • SpongeBob: Are you sure? Mrs. Puff: Yes. SpongeBob: Are you sure you're sure? Mrs. Puff: Yes. SpongeBob: Are you sure you're sure you're sure? Mrs. Puff: Yes, I'm sure! — 2010