Here is an example by the famous Basho Matsuo (1644-1694):
Bush clover in blossom waves
A drop of dew.
However, that doesn't mean haiku have to be stuffy. Check out this one by Issa, who lived from 1763-1827:
Don't worry, spiders,
I keep house
The syllables don't work out exactly because of the translation, but I find it comforting and a little bit hilarious that people across the world over 200 years ago had the same problem I have!