If you had* an arch-nemesis, who would it be?

Survey Says:
"Lois! She always messes with my plans to rule the world!"
"tighty whities"
"stupidity and humidity are my rhyming nemeses"
"Flaccidtron, the impotence robot"
"Mormons?"
"Keith **, a costume designer from high school"
"Ursula from the Little Mermaid"
"Myself"
"I have a few nemeses...most of them are frat guys"



Analysis:
Another fun one.
* If you already have an arch-nemesis, you are welcome to use him/her/it as your answer. You can also postulate a new one.
** Names omitted. I considered changing them, just for the fun of it, but that might negatively affect the purity of my research.