"Gronk's Apology" is one of the Easter Egg letters in the game, which can be dropped by all of monsters. The letters contain personal problems or stories.
"big boss demon say I haff to rite to explane akshun. OK. it simple: gronk smash ukla cuz ukla make fun of gronks club. you see? I haff every reeson to smash ukla. no need to push gronk in pit of dispare. i hope you see now that i had no choyce, pleese no pit of dispare? gronk thank you for your niceness!"