OK, I bet this is a really classic dream, and I think there was more to it, but here's what I remember:
I was sitting around with my friends outside, in some sort of weird martian red landscape, with loads of rocks and things. All my friends were there, and I felt really comfortable and warm. There was a whirlpool of yellow gunk in the middle of where we were all sitting, and some people were playing in and around it. All of a sudden, one gets sucked in, or falls in or something. Someone dives in afterwards, to try to save him. All I remember was thinking that the good atmosphere was ruined, along with a much weaker sense of loss. I dived in after the two of them anyway, and managed to save the guy who had gone in after the first guy, so we got out safe. The other guy was lost. Then I woke up. The thing is that the people that fell in were just miscellaneous people, nobody specific. There it is :)