Hard Day in Pre K

Brian was off on spring break already today so he picked Kade up from school at noon. The following conversation took place:
Kade: 4 people got their pen's flipped today . . . . but not me
Brian: are you sure, not you?
K: yeah, it was hard holding that mean in . . .
B: huh?
K: my head was going "grrrrrrr" (clinching his teeth & grunting)
B: it was?
K: yeah, and when it was over it went "whew"
B: what were ya'll doing that everyone was getting in trouble?
K: oh . . . . I don't remember