Yesterday, I was riding a commuter bus home during rush hour, and a preganant lady (very obviously so) gets on, but all the seats were occupied.
So she stands, with no one sitting around her, offering her a seat. After about a minute, I call out from about 10 rows away from where she was standing and offer her my seat.
I know that the bus ride was about 40 minutes long and people don't like to be inconvenienced, but this was ridiculous.
It made be mad, and still does when I think about it.