What strange things have you encountered on a plane?

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Two years ago, when 吉祥 Airlines flew to Helsinki, a flight attendant came to serve drinks. I asked what they had, and she surprisingly rolled her eyes at me, skipped me, and served others. The three of us in this row were all stunned.
After a while, I opened the tray table and found a few drops of oil on it (probably leftover from the previous passenger who didn't clean up). I called the flight attendant, and coincidentally, it was that same attendant. I explained the issue to her, and she turned around, grabbed a bunch of wet wipes, and without saying a word, threw them on my table and walked away.
I really don’t know if she’s an intern or on her period. I was polite the whole time, saying "please" and "thank you" non-stop. I don’t understand what’s so impressive about this flight attendant.
My buddy reported her right after getting off the plane, and I’ve never flown 吉祥 Airlines again.