Re: Please don't laugh
Like many threads the poor OP, who has a legitimate question, gets a bunch of contradictory info for a variety of reasons. Many of the "I've never had a problem" type, which with a statistical sample of one doesn't mean much . . . I could totally imagine the lever type getting knocked out, especially with the handle down. Likely? No, but possible.
Based on reading threads with the same question for years my very unstatistically viable conclusion is:
Inside if you can, outside if you can't. For the rubber expansion type, a threaded T-handle is probably best for outside if you don't have a "Garboard" plug (threaded brass type).