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->''I used to be such a sweet sweet thing 'til they got a hold of me.''
->''[[NiceGuy I opened doors for little old ladies. I helped the blind to see.]]''
->''I got no friends 'cause they read the papers. [[LonersAreFreaks They can't be seen]]''
->''With me, and I'm gettin' real shot down and I'm feeling mean.''
-->-- '''Music/AliceCooper''', ''No More Mr. Nice Guy''

When a character grows into a {{jerkass}} over time (sometimes not much of it at all). Can be due to {{flanderization}}, a FaceHeelTurn, or just another regular albeit unfortunate case of CharacterDevelopment. While a JerkAss growing into a JerkWithAHeartOfGold is a common phenomenon, especially in dramas, a reversal, resulting in this trope, is also common, especially in comedies.

This can also cause tropes like WhatTheHellHero, though whether if the character changes for the better after that is well DependingOnTheWriter. If the transition is shown as a flashback regarding a known jerk/villain, it may be a StartOfDarkness.
See also TookALevelInBadass, TookALevelInDumbass, CynicismCatalyst and JumpingOffTheSlipperySlope. When a character has this temporary for the sake of the plot, the JerkassBall is present. The [[OppositeTropes Counter Trope]] to TookALevelInKindness. Contrast BitchInSheepsClothing, who was always a jerk. A character taking his/her level in jerkassitude was genuinely nice. When a character becomes more of a jerk in an adaptation, that's AdaptationalVillainy.

[[noreallife]]
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!!Examples

[[index]]
* TookALevelInJerkass/AnimeAndManga
* TookALevelInJerkass/ComicBooks
* TookALevelInJerkass/FanFiction
* TookALevelInJerkass/{{Film}}
* TookALevelInJerkass/{{Literature}}
* TookALevelInJerkass/LiveActionTV
* TookALevelInJerkass/VideoGames
* TookALevelInJerkass/WebComics
* TookALevelInJerkass/WebOriginal
* TookALevelInJerkass/WesternAnimation

[[folder: Professional Wrestling]]
* [[Wrestling/BlackRose La Rosa Negra]] suddenly became a jerkass in the PWS after a couple shows in. It was eventually revealed this was because Vinny Fenucci had practically appointed her to become the next Bombshells champion in the event someone "not pretty enough" won the tournament.
[[/folder]]
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