A few guesses:

• This isn’t your apartment — you’re apartment sitting for your significant other’s ex.
• You’re a photographer and needed to do a photo shoot in a ball pit?
• Roommate’s on your case about doing something with your life, and you are insufferable.
• You’re in a miserable relationship and have forgotten what happiness is and how to achieve it.
• You got all this ball pit stuff for free and thought “why not, I guess we can film it.”
• You are crazy.
• You hate how big your NYC apartment is and how much extra space you have.
• You…aahhhhh…?
• You thought it would be fun but were ultimately disappointed, though that’s not something you’re going to express.

(Via ViralViral.)