Wake the fuck up it's time to learn Spanish you little shit
—Duo's first threat to you
Looks like you forgot your Spanish lessons again. You know what happens now!
—Duo while he breaks into your house
Spanish or vanish
—Duo's threat when you miss a Spanish lesson
Looks like you forgot your Korean lessons again. You know what happens now!
—Duo while he sends a ballistic missile to your house
Looks like you forgot your Romanian lessons again. You know what happens now!
—Duo on his way to impale you with a burning stake
Looks like you forgot your Italian lessons again. Good luck talking your way out of this one!
—Duo while he sends the Mafia to your house
Looks like you forgot your French lessons again. Adieu to that trip to Paris then.
—Duo while he sets the Notre Dame Cathedral on fire
If you try to delete Duolingo, I'll delete your family.
—Duo when you try to uninstall Duolingo
The Oompa Loompas will dance tonight.
—Duo after you've lost a streak