Your watching a kids film, Small Soldiers in this case, and it suddenly gets a bit creepy with demented mutant Barbie dolls. Then, to my surprise, Led Zeppelin kicks in!
Fast forward to 4:23 and enjoy.
Have you ever been surprised by a piece of music in a film? For example, I would have gone for The Boys Are Back In Town - a song about drunkenness, fighting and sexism - used for Toy Story, but I think it was only used in the trailer.