While some may argue that all cats are vying for the title of world’s worst cat, people on Twitter are sharing their contenders for the No. 1 position.
It all began with one tweet about a particularly bad cat, whose preferred mode of rousing his human servants involved first waking their sleeping baby ― a method he has clearly found to be reliable:

Christopher Ingraham
The World’s Worst Cat has discovered that he can wake the big people up by barging into the toddler’s room at 6 AM and waking *him* up.
It turns out that this particular troublemaker doesn’t even have a motive. His only purpose is to create chaos.

Christopher Ingraham
He literally throws himself against the door until it flies open. The pounding terrifies the 2 year old, who starts screaming. Then once we're up the cat goes tear-assing through the house because he knows if we catch him we'll toss him outside.
Other cat owners had little sympathy, and Twitter quickly broke out into a competition to claim the title of World’s Worst Cat:

bluebonnetdem
World’s worst #cat, you said? This couch begs to differ.

Kristen Parisi
My world's worst cat chews on my feet to wake me up in the morning. If that doesn't work, she starts pushing books off my desk

baylor sucks
my evil cat just stares at me like this until i get up and feed him

Ashley Holt
Oh, are we talking about the world’s worst cat? Meet Chandler.

me
At 4:30am my cat comes into my room, opens all the shutters to my windows, then closes the door on himself somewhere in the house and scratches/meows loudly until I get up to free him. Video proof of him opening the shutters...

This cat needs food. Give him all the food.
My world's worst cat would like a moment of your time. I haven't slept a full night in bed for over a year.

Cabbage
Worst cat award would have to go to this guy, who smashed our tv because he didn’t get a second breakfast...

Ty McCormick
Cat people: what does one do about this problem? Anchovy loves playing in the dirt and flings it out of the pot faster than @JillFilipovic or I can put it back in. I’ve thought about tin foil, but don’t love the aesthetic. Suggestions?

Jill Filipovic
Meet the worst cat.

Euphemistically Speaking
Every cat is tied for the worst cat.
Maybe you should consider getting a dog.