If you care about keeping your domain enough that you don’t want there to be an excuse for someone to take it from you, then you use your real info, and choose a registrar that only exposes a proxy contact in your WHOIS entry.
If you don’t care about losing your domain, then you can use fake contact info.
I continue to be impressed by how far we’ve come in algorithmically imitating forces of nature. If you like this stuff, have a look at the EmberGen demo clips