In the below video from her appearance on The Ellen Degeneres Show, Miley Cyrus giggles so much she nearly pulls a muscle. She also lays down in her chair and shreaks. Miley has the giggle of a 50-year-old lifelong smoker, and yet, still, again, Miley comes off looking like a pretty typical 16-year-old girl. How is this possible? We are completely baffled by her ability to remain genuine-seeming while selling concert tickets for $3,000 apiece.   

Will someone please watch the Ellen clip and explain all this to us? 

[via Dlisted]