<human>: Can you condense the text into a few key points?

I go to a pretty normal sixth form which is within a school in the UK. The arrangement works really well normally, and usually everyone gets along. We broke up for Christmas yesterday, and my last class was Computer Science.

The teacher came in early on and basically just let us do whatever, because it was the last lesson of term. He then went away back to his office. The eight of us all settled down and did some programming.

There was a Year 9 class next door (think 13/14 year olds) and they were sometimes looking through the glass between the rooms. Unfortunately some of my mates are rather quick to anger and they got increasingly angry towards this class. A few of those Year 9s live near me and seem alright, but I was too caught up in staying loyal to my class that I never really thought about what would end up happening as the conflict escalated.

Some of my mates decided to write some Star Wars spoilers on a piece of paper and put it to the window. I won't reproduce them here. Unfortunately I did not intervene in time, despite having ample opportunities to do so, and so they were able to spoil Star Wars for the class next door.

A little while later, on my way out of the building, a few of them accosted me. I am the most well-known of my Computer Science class (that's a completely different story), and so they asked me why I spoiled it. I replied that it was not my idea, and so they told me to have words with the rest of my class. They were obviously very frustrated at the events, and in particular one of them told me that he had been planning to see it later on. The group of them left me, but it was clear to me at this point that this is not the last I will hear of this, and no doubt some conflict will come of it.
<bot>: Failed to prevent my CS class from spoiling Star Wars, now there is real tension between us and a neighboring class.