<human>: Today whilst bringing my younger brother home from work, I came up to a small roundabout in the middle of town; there was a guy to the left of me and clear road to the right (I'm in the UK, so you give way to the right hand side) and as I went straight over (must've been doing about 16/17mph) the CUNT to the left of me literally waits until about a second after I move onto the roundabout and then moves off himself, so he's LITERALLY driving INTO THE SIDE OF MY FUCKING CAR. THE PASSENGER SIDE. WHERE MY YOUNGER BROTHER IS SITTING. Oh my god, I couldn't even speak I was so angry. I ended up swerving across the roundabout using the wrong side of the road and lining back up afterwards. My bro had to make me pull over and calm me down so I didn't pull a U and follow the guy and beat his ass.

Can you condense the text into three sentences or less?
<bot>: crossing a roundabout, guy nearly smashes up the left hand side of my car/my 17 y/o brother and I flip shit. Describe bad driving that has angered you.