Today I was refactoring code with 10 levels of indentation. Java 8.
Lambdas.
Each one is a block which spans multiple lines, that makes the outer ones hundreds of lines long.

This should be forbidden: () -> { ... }

If you don't understand why, please never send me any code.

PS: intellij shows multiple errors on each line.

PPS: my colleague should be happy that I do not use swear words.