Unaware of the other hobbits laughing at him, Pippin continued to try and swim his way to Rivendell.
-Or-
Pippin: It's just not working, Sam. No matter how hard I try, I can't make myself believe I'm swimming in the Brandywine.
Sam: *concealing a smile and stifling a laugh* Kick harder.
Merry and Frodo are doubled over with laughter behind a bush.