Proof by Contradiction
A triangle with two right angles is dying (impossible in Euclidean geometry) and goes peacefully to elliptic space, where it can exist.
Content note: Mock deathbed scene.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2019-02-25-proof-by-contradiction/ (CC BY-NC 4.0)Transcript
A (holding a dying triangle): "NOOOOOO! Don't give up on me, Triangle With Two Right Angles!"
Triangle: "It's okay. I go to a better space. An elliptic space…"