I'm working on a poem right now, the first line of which contains either "in to" or "into" ----
The one I select affects the entire line's implications: Am I talking about a man entering a room, presumably a bedroom? Choose the former. Am I talking about a . . . man entering a, ah, vagina? Pick the latter.
See kids, this is why English class is so important. When you're writing an email to your boss, you had better be darned sure you know the difference between "in to" and "into" ----