I've done 1), 3), 5)

and 6) -- I once wrote a pretty emotional email to my 闺蜜 and it was sent to my boss. I didn't realize it until my boss returned it.

Last Fall, I bought very expensive mooncakes from a famous bakery and then went to a restaurant next door for lunch. Haha, you know what happened ... The funniest was that none of waiters said they had seen them when I went back to look for my mooncakes the next day. If they didn't see them, they must have eaten them! It is good as long as someone ate them. Then I was relieved.