Comment by benmanns

Some that I bought:

https://xn--ujdaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...

https://mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm...

http://mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm...

Why? They're the widest domains you can get within the character limits. Good for testing UI for bad wrapping with long data. Hacker News handles it pretty well.