A quiet Banner is almost always a Banner up to no good...

Banner:  "Mama, mama, mama!  I no fall asleep in the car!"

Me:  "Yeah.  I can see that.  Hey, Trev?"

Trevor:  "Yeah?"

Me:  "So, apparently, we forgot to take the pen away from Banner after lunch."

Trevor:  "Why? [Looks in car]  Oh."