Witch King: Oh my GOD Gandalf, must you always leave yourself as a prime target for the "uncloaking" jokes?
OR
Pippin: Oh no Gandalf's gone and his cape is left behind!
Why does he have to impersonate Archimedes at a time like this?
(get it, Archimedes running out of the bath saying Eureka? YOU DON'T?! <sigh>)