well I'll go with the staples,
- cloud, wind, dust and outside lights.
others.
The bloody stray cat we have staying with us, silent as can be then brushes against your leg frightens the crap out of me,
Mosquito's,
Setting up everything start to take shots and realize you've forgotten to collimate the scope,
Forgetting to add the extension tube for the guide camera ( why can't I find guide star anywhere?).
Setting the scope up and powering the mount up and setting up the date and time and seeing the last time you used the mount, sometimes it enough to make you cry.
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