I'm going to echo yeahright's guesses...
Dan Aykroyd, Jesse Ventura, Charlie Sheen, etc. I imagine there could be many, but they'd keep their real identities private, for obvious reasons.
Even in the rare event they do come out to staff (which is rare in the extreme), we of course wouldn't divulge the info, just as we wouldn't do so
for ANY other member...and respect their privacy.
We have had some celebrity guest speaker events, etc., so they may or may not have created other accounts to stay on, who knows? To be honest, we
wouldn't know unless they told us.