No jumping on the bed

[Jason, who was not yet two years old, had climbed onto Brianna's bed and was testing the bed's springiness.]

Laura: "Jason, don't jump on the bed."
Brianna [climbing on the bed, eager to show that she can jump higher than Jason]: "Can I jump on the bed?"
Laura: "No, Brianna, we don't want Jason to jump on the bed and fall off. So you must not jump either or he'll copy you."
Brianna [switching from jumping to running in circles]: "Can I skip on the bed?"
Laura: "No, Brianna. No jumping, skipping or running on the bed."
Brianna[slowing to a walk]: "Can I just walk on the bed?"
Laura [looking at me as we both stood there in disbelief]: "Can I just bang my head against the wall?"