Lately, when a Sim of mine invites another over via the phone, strangeness ensues.
They greet, step back, and then the visitor{s} begin to gibber, impersonate chickens etc., the whole insane deal.
My Sim spins his finger upside his head and wanders off to do something else. The crazy Sim[s] eventually recover and things return to normal with only the odd mop dance or monkey-shins every once in a while.
While it's more amusing to me than anything else, I am curious what might be causing it. I have Nightlife and Seasons.