Ugliness test

I'm making a new language. I think I have already fixed most of design flaws, but I need to check it first before writing a real interpreter.
Post your code snippets, I will translate them to my lang and we will decide whether they are beautiful enough.

>>28
1,2:
If you see unknown operator, you call it ugly? Great!
"=>" is a `match` operator.
"::" is a `define-operator` operator.
3:
In case you see "(lambda () ...)" do you complain about empty parens?
4:
You can use display without formatting string. What's the problem?