If you asked any of them what happened the night before, they could honestly say they didn't remember. Natalie was 90- no wait- 89.9 percent sure she hadn't used any kind of serum but she couldn't say for sure.
It had been the best and last night of camp, and they didn't remember it. They all packed(Elizabeth snuck the pink bunny suit into Hamilton's bag), and ready to go.
Goodbyes were said and before they left they agreed on one thing: They would come back to camp on January 8th. And Natalie would bring plenty of truth serum.