They can be funny and they can be a nuisance, like a buzzing mosquito, but they are completely irrelevant to the mediations process. Meditation takes us into deeper layers of consciousness than mere thought.
Shower thoughts are about planning, getting things done, gettin clean, something someone said, a song you like, all kinds of random things, and they can be tied to intention or not. The ego-mind cannot be still in the present moment, so it seeks to distract itself with all kinds of thoughts, some of which are actually useful and problem-solving but others are just mental clutter.
The whole point of meditation is to go beyond this metal noise and get to a place of quiet peace. Therefore, thoughts during meditation are useless.