<human>: I went to the gym, as I was walkin out, it had started to rain pretty hard. I live quite far from the gym, and I had forgotten my umbrella, so I was gonna get totally wet. There was a bunch of umbrellas, left unguarded by other customers, and I thought "probably the 80% of the people here has his home quite near, so they won't get really wet, if I take their umbrella. Then, I will put it back here next time, as someone might need it, and steal it as I did"
I stole one, didn't get wet.

It's just mathematics: I did a bad thing to a person (-1), but I did a good thing to myself (+0.5) and almost* another person (+0.5). In the worst scenario, the sum is 0. If the second guy, uses it to help someone as I did, we're 0.5 over, and so on.

Can you give me a shortened version of the text?
<bot>: STOLE AN UMBRELLA, BUT TOOK IT BACK TO THE PLACE TO BE STOLEN BY SOMEONE ELSE