Why would you want to ssh into a machine that's not yours? That's a violation of the Computer Frauds and Abuse Act, up to 10 years in prison!

When you have permission to do so, it isn’t.

I think you're joking, but to clarify -- not personally yours. A misbehaving worker box, an app server in the staging environment, etc. A resource owned by the organization for which you work, where it would not be appropriate for you to customize it to your own liking