Did I do that?!?!

Miss T. just graduated from a car seat to a booster.  Can we say THRILLED?!  She was ecstatic.  Talullah came up to me, almost frantic.  "MOM!  Someone made a HUGE mess in the school room.  I don't know who could have done it.  It must have happened while we were gone."  Considering the fact that all of her sisters were asleep, I found this intriguing enough to stop making dinner and go see what my dearest daughter was talking about.  Sure enough, there was quite a mess.  Pens on the floor, craft supplies scattered everywhere, tape, glue, toilet paper rolls...  Very suspicious.
Talullah then comes out of her room with her new 'race car' all dolled up with stripes and glitter.  Super cool car, Talullah.  But... who on earth could have made that huge mess in the school room?  I'm totally stumped.