The expression like a ton of bricks means a crushing weight would being hit by an actual ton of bricks hurt if it happened on the moon

On the moon, the force of gravity is about one-sixth of the gravity on Earth. This means that if a ton of bricks fell on someone on the moon, they would experience significantly less force compared to if the same thing happened on Earth. The person would likely still be injured or crushed by the weight of the bricks, but it would not have the same devastating impact as it would on Earth.