I lied to my boss and co-workers.. what should I do?

Today, a situation happened to me at work that was semi-crazy. But while beginning to tell the story to my two bosses and two coworkers, it started to seem boring so I decided to lie and jazz up the story, making it funnier and even crazier. They all believed me, and were laughing like crazy. I was so happy to be liked until my boss said “omg that’s so funny I should look at the security tapes and watch it all go down.” The other boss agreed and we all laughed but walked away from each other soon after. I have since left but I have been scared out of my mind that they may actually review the tapes to show me tomorrow for another laugh, only to find I completely had lied!!! I’m praying they either forget or don’t want to go through the tapes (it’s a huge company with over 10,000 customers a day so they would be searching for it since I told them a fake time stamp.) But i’m worried they will look at it and when they do, they will call me out on it and I’ll look horrible. I want to have a speech prepared for if they do look through the tapes. What should I do?