Mind-blowing things that happen during lucid dreams (knowing you are dead, and seeing yourself as a third party)

Two of the more unusual things that can happen during lucid dreams are (a) to see a bunch of friends and relatives gathering at some future party, and knowing that you are dead, and (b) seeing yourself in a dream, as if you were someone else watching you.

I have had both of those happen to me, and both are a little mind-blowing.