How can 'nothing' exist?

[Wraxtiorre]

"Oboy, is it time for my famous Desk Test?" The Cartoon Dog began dragging the desk away from the wall towards the center of the room.
The Stoic Cat rushed up against the desk, growling as he pushed in the opposite direction. "Oh, no you don't! They're not that gullible. Besides, this is a 'Nothing' question, not an 'Existence' question."
The Cartoon Dog looked up. "But I see the word 'exist' up there in the question. And, look, there! In the Details it says, 'does it exist?' That clinches it!" He charged the side of the desk, ramming his full weight into it.
The Stoic Cat stepped aside unexpectedly, allowing the desk to sail out the window.
The Cartoon Dog flopped on the floor in the space where the desk had been. "Well, that wasn't very nice. What do we do now?"
"Nothing, I guess." The Stoic Cat leaned against the wall. "What do you do when you are bored?"
The Cartoon Dog brightened up. "Sometimes, I like to close my eyes and bash my paws on my closed eyelids. It's like fireworks in my head. What do you like to do?"
"Sometimes, I like to sit upright in an awkward chair while balancing a piping hot cup of tea on a single claw." The Stoic Cat looked around. "And recite devotions to Carrie Underwood."
The Cartoon Dog opened its eyes in shock. "You like her?"
The Stoic Cat looked away and pondered, "What's not to like?"
The Cartoon Dog leaned back in dismay. "Uh, her voice."
A fan suddenly popped into the window and exclaimed, "Hey, I like her singing voice!"
The Cartoon Dog blinked again, and suddenly remembered what he was doing. He closed his eyes and began to bash his paws on his closed eyelids. "Ooh, good one!"
The Stoic Cat waxed philosophic about the charms of Carrie Underwood. "What was it that Ophelia said to Hamlet at the play? Ah, yes, my dear Miss Underwood. She said that she thought nothing about Hamlet putting his head upon her lap. He was restful, so odd . . . " He looked up at the center of the room. "What are you doing?"
The Cartoon Dog gasped and wheezed. "I'm dangling from the chandelier so that I can hurl myself out the window. What better way to experience the nothingness of the inside of your eyelids than to be unconscious?" With that, he heaved himself into a stronger swing and released his grip on the chandelier.
The Stoic Cat watched the Cartoon Dog sail out the window. He leaned over the sill and shouted, "Look out for that desk!"
Thunk!
The Stoic Cat winced and then looked fearfully downward out the window. "Well, if that doesn't prove that the Desk exists, I don't know what does." He walked away from the window. The Door suddenly flew open, revealing the Cartoon Dog standing in the hallway, encircled by twittering birds. "Owee!"
The Stoic Cat rushed forward, grabbing the Cartoon Dog's arm. "You fool! I'm the one who has nine lives. Well, it's a good thing you're a cartoon and don't feel any pain."