hippopotomonstrosesquipedaliophobia
the fear of long words, which, ironically, is so ridiculously long that even people without hippopotomonstrosesquipedaliophobia may get overwhelmed by it
Pam: so you have hippopotomonstrosesquipedaliophobia
Ellen: SHHH
Pam: *grins*
Ellen: don't you dare
Pam: iiiiiiiiiit's SUPERCALIFRAGILI--
Ellen: *runs away, screaming*