We open with a flashback to Shawn and Henry in the vice principal's office. Henry asserts that Shawn didn't have permission to go on the field trip, but the vice principal shows him the signed permission slip. He even has three other signed permission slips to compare them to. Henry immediately tells him it's a forgery. The vice principal doubts a child Shawn's age could make such a good forgery, but Henry knows he can. Shawn, wisely silent till now, comments the supposed forgery really does look like the real signatures. This was a mistake: he gave himself away, and now even the vice principal knows he forged the permission slip.