Woke Up in a Coffin?

After enduring Aunt May's intense interrogation, Peter lay on his bedroom bed, utterly exhausted in body and mind. It turned out Peter himself had gotten the date wrong. Aunt May had indeed originally been scheduled to be out all day this Saturday, but so she could spend the weekend with Peter, she had traded shifts with a coworker and moved it to next Monday. She had told him about it. But Peter had been busy thinking about Toomes's weapon workshop at the time and hadn't listened carefully to Aunt May.