Unknown to Pippin, the "Man" behind him was actually Sauron in disguise.
or
Pippin: Hang on Merry! You'll make it!
Merry: I'm not injured!! You know what I saw in Fangorn Forest? He's here again!
Pippin: GANDALF!!!!
or even
Merry: Oh no it's Mount Zoom!!
Pippin: And there's Minas Tirith! We're saved!
Merry: No! It's got wheels to!!
Pippin: AHHH!!!!