Gordon has a trouble face he makes, where he lowers his eyebrows and looks at you under them.
We were at Grandma's house and Grandma told Gordon he couldn't do something, maybe it was that he couldn't eat in the living room or something. Gordon looked over at Grandma, with his trouble face, and said, "Grandma is trouble!"
Mia who was also in the same room overheard this and after contemplating it for a while said, "Oh yeah? Then WHY is it called GRANDMA'S HOUSE!?"