Young Shatter (red, was Cloudy Mist at this point) and Dropkick (Blue coat, was Blue Quartz at the time) messing with a sleeping Thundercracker by drawing some graphic images. Thundercracker is completely fine, he just always slept in class, particularly for Math, hence the reason he flunked a quiz. The three are also in the back of the room and in general didn't care about their grades.

This was before the conflict and war, so they're happy and innocent fillies and colts at this time. Even though, their behavior was quite troubling by what's going on in the picture.