[Most likely because they're what Shinji said they were: complete idiots. It was humorous because Yukiko is trying her best at getting the buggers to the springs.]
♫ Green Christmas Style Hee-ho-hee-hee Ho, Green Christmas Style Green Christmas Style Hee-ho-hee-hee Ho, Green Chistmas Style ♫
[When she reached the spring...she...might have accidentally had fallen into the water. Oops.]
[Action]
♫ Green Christmas Style
Hee-ho-hee-hee
Ho, Green Christmas Style
Green Christmas Style
Hee-ho-hee-hee
Ho, Green Chistmas Style ♫
[When she reached the spring...she...might have accidentally had fallen into the water. Oops.]