You haven't really made it as a villain in pop culture until somebody carves your face into an orange gourd. 

 

1. The Joker

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Source: galleryhip

2. Bane

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Source:  imgarcade

3. Freddy Krueger

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Source: fantasypumpkins

4. Gollum

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Source: flickr

5. Loki

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Source: cheezburger

6. Maleficent

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Source: disneyvillains