"Don't even get me started on over or under..."

From an AP news article:

MOSS BLUFF, Fla. Feb 21, 2006 (AP)— A man accused of fatally beating his roommate with a sledgehammer and a claw hammer because there was no toilet paper in their home has been arrested.

overreact
verb
To react with unnecessary or inappropriate force, emotional display, or violence.
"overreact." The American Heritage® Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. Answers.com 21 Feb. 2006. http://www.answers.com/topic/overreact