What would you like to look at under a microscope?

The other night I looked at what I call a “sleepy man” that fell from the corner of my eye using a jewellers X 10 magnifying thing. It made it look like a crystal.
Made me think of what I’d like to look at under a microscope -( or just plain magnified if it wouldn’t fit under a ‘scope ).
I once had a bone marrow sample taken from me and the doctor later on showed me a photograph of one of my blood cells magnified many times – it was like something out of science fiction ( I was later diagnosed with megalobastacism or pernicious anemia where the blood cells become very bloated and weak instead of tight and strong ).
Its a totally different world under the microscope