Sure. If you are talking about something that happened before, the simple past is appropriate. I never saw the man who stabbed me in the back. I never saw it coming. If the action is continuing into the present or still important in the present use the present perfect. I've never seen a purple cow and hope to never see one; but I can tell you anyhow I'd rather see than be one.

Haha why not?

correct. cowboy...

Yes, it is.

yes