Dead kittens. Can't get a pitchfork into the bricks.
Only one can be emptied with a pitchfork.
If you lay a brick it doesn't follow you home.
You can't unload sand with pitchforks.
Babies, because you can use a pitchfork.
You can't unload a truck full of bowling balls with a pitchfork.
There is none. In both cases, if you don't have one, you unload by hand.