I had one of the worst parties ever in the game (well the sims thought it was epic because the guy who threw the party has the LTR that always makes his parties good)

Every sink in the house and every toilet broke whenever a sim used them. Then when everyone was singing the birthday song to my sim, one of the party guests keeled over dead from old age and the grim reaper came by, took his soul and ate some cake. The dead guy's wife was the "unlucky" one. Kind of odd that she burst into tears and screamed over her husband's grave, then she complained about the water all over the floor and the dirty dishes, but left the house with a big "smileyface+party balloons" thought bubble over her head when she left.

Was this just a series of unfortunate events, or can unlucky sims cause things like this to happen?

Sims with unlucky trait break things more often, so that might explain the sinks and the toilets.

As for the death... well... I wish my parties ended with just one dead body http://modthesims.info/showthread.php?t=453770

How can you do that?
There is no birthday song in my game, you can consider your sims lucky to have the birthday singing.

Maybe they meant when the sims come over and cheer?

Yes. I meant when they all gather around the cake and cheer for two hours.

Lexilu -- That's hilarious!!