Depending a klutzy moment can make something go from serious to more lighthearted, it just depends on who is involved. But like, normally things I know that're good at that are something funny klutzy, or like, argument wise when one just tries to look tough/glare and ends up puffing out their cheeks and they look ridiculous, but they're trying to look grumpy tough(like my 3 yo he does that and it can make something go from tantrum to me busting out laughing at him... similar happened but w/o the pout when I argued w/ my mom as a teen once, we were amping up mad and insulting each other ad then glaring and BAM all of a sudden burst out laughing at how ridiculous we were being).
So if it's something like that maybe something similar, but more fitting for what the situation is? Or like, if not like that maybe something rustling in the bushes, freaking someone out and then it comes out and it's something cute and/or harmless? It just totally depends on the situation, but if you ever need someone to bounce ideas off of... I'm around.
Also if you want to read something that can go from intense to hilarious in a few seconds flat... read the comic/manga(though not Japanese I know the original novels were Taiwanese), 1/2 Prince. It's a mix of future and fantasy but it just gets great: