Grace Helbig is known for doing a lot of the challenges that pop up on YouTube.

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Her latest go is at "The SpeechJammer Challenge," in which she had fellow YouTuber Joey Graceffa join her for it.

Graceffa insisted on Twitter Monday that they "WEREN'T DRUNK" as they filmed this challenge video.

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So what is this challenge exactly? Well, SpeechJammer is an app that allows you to literally jam someone's voice. It has a delayed auditory feedback effect, which causes the speaker to have trouble articulating while they speak, which therefore inhibits their speech. In short, when you hear your own voice at a delay, you'll wind up mumbling and slurring, which is the equivalent of jamming your voice. The delay causes interference.

So the object of this challenge is to use the app and recite well-known songs and such to see who gets the farthest before they jam up.

The pair tried reciting the alphabet, the Pledge of Allegiance, "Twinkle, Twinkle, Little Star" and "Itsy Bitsy Spider," which proved to be more challenging than they initially thought.

They also had a sudden death round too, in which they each picked a song they know by heart.

"It's very stressful!" Helbig dished at one point in the video.

The two correlated the effects of the app on their speech as someone having a stroke. It really alters one's speech that much!

Watch the hilarity ensue below! See if Helbig won this challenge or not.

Tags: Grace Helbig Joey Graceffa