What is the one memory you try to forget?

I laughed at my friend Brett (a boy) and I'd rather not say the reason, and he cried and I was breathing hardly and sniffling because I was trying not to cry. Then when the teacher walked up to me and was mad at me and said "You made him cry..."and all that, I burst out crying. And when I came back from the bathroom drying my face from the tears, everybody was asking things like "Are you okay?" and "What happened?" and I was just thinking "You shouldn't have sympathy for me. I didn't get hurt by someone." and then my other friend Zach walked by and said "You made Brett cry! I've only seen him cry 2 times!" and I'm just thinking "SHUT UP." then at recess I apologized and he forgave me. But still...