blonde emergency kit

Josh was helping Sally, a blonde, clean out the trunk of her car. Inside, he noticed a bag labeled "Emergency Repair Kit". Looking at it a little closer, he noticed a stick of dynamite inside.

Thinking that was a bit strange, he asked Sally what it was for.

She said, "It's part of my emergency repair kit."

Josh said, "I can see that, but why?"

Sally replied, "In case I have a flat and need to blow up one of my tires."