A baby is drowning in the lake:

-Fallout 1

Ask for more information
Agree to help
Decide not to help
Accidentally say something that pisses the NPC off, failing the quest
Reveal too much information about yourself, causing the Super Mutants to track your vault more easily

-Fallout 2

Ask for more information
Agree to help
Decide not to help
Accidentally say something that pisses the NPC off, failing the quest
Pop culture reference about the baby

-Fallout 3
Yes, I will save the baby
Depends on the caps
I will not save the baby
[Intelligence] The baby is drowning

-Fallout New Vegas
I will save the baby
I will not save the baby
[Barter 30] Double the caps and I'll save the baby
[Medicine 30] Thanks to my medical knowledge, I will easily be able to save the baby
[Survival 15/30] Uh... yeah, I totally know how to swim

-Fallout 4
Yes
No (Yes)
Sarcastic (Yes)
Hate babies