Rocks: The orcs' weakness.

[Aerandir Carnesir]

Did anybody else notice that the orcs are very succeptible(sp?) to rocks thrown by Hobbits and young children? In the FotR, Merry and Pippin start throwing rocks at the Uruk-Hai right before they get captured, and the Uruks go down like a bag of...well, rocks. In the Two Towers, when the fully armed Uruks were charging the main gate, Those little kids above it were tossing those rocks and the Uruk-Hai again, went down like a bag of rocks. And finally, when the Ents attacked Isengard, Merry and Pippin again threw some rocks and the orcs went down like a smaller bag of rocks. Does anyone else think that rocks could have turned the tide in some of the battles? Or does anyone just want to discuss how orcs are so weak to rocks(at least in the movies).