Right, I've just started watching the show again from season one episode one. So I will post here as and when I find these common moments.
Probably not as unintentional as it first may seem, but my first contender is in the Pilot episode: Tony's second panic attack (or, as Livia might say, fit), in the Green Grove retirement home. Livia's complaining, the attention is on her, and Tony just collapses and takes a table with him in the process.
More to come, for sure.
Mick