What small thing did you do that ended up having a massive effect?

Bruh I visited my friend on the other side of the world and she kept on joking around on how she didn't use protection, I told her that its completely stupid not to use protection and she kind of just blew it off, when I came back home after a couple weeks she told me she was pregnant, so before I even got there she was pregnant and joked about getting pregnant while she is in a situation where she barely scrapes by with money and now has to raise a kid on her own because her on/off again boyfriend who "changed" didn't really change and doesn't want to help her raise the kid so she has to move to another country where her mom lives so she doesn't raise it alone.

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