[WAT] Weird conversion error in SQL Server

Here's a fun conversion that will bite you.

DECLARE @test VARCHAR(10)
SET @test = '50000'
SELECT convert(varchar(5), convert(int, @test))


You get back "50000".
Now do this:

DECLARE @test VARCHAR(10)
SET @test = '500000'
SELECT convert(varchar(5), convert(int, @test))

What do you get back? "*". Nifty.