Go On, Try

Try to look, act and even talk serious while eating a banana. Try!
I swear its just about impossible. Try telling someone that there's a tsunami just about to hit (I don't care if you don't live anywhere near the sea!) while eating a banana. It's impossyble! They'll never take you seriously... I mean, apart from the fact that you're lying.
No way can you possibly say anything even slightly grave while eating a banana.