請問 rock the boat 點解?

想像下一班人坐o係艇仔，有個人傻左咁企起身係咁郁，搖隻艇（rock the boat），係乜野情況？
rock the boat就係指有人做一ｄ事，令成船人（即其他人）受威脅，搞破壞。例：
He was really rocking the boat by blaming Tom after the team lost the match.
其實用下想像力，有ｄidiom都有成個好生動o既畫面架。