hmm there are a few things you can do to make a conversation NEVER end...
Getting stoned is usually a sure thing lol... but in a Zpoc that wouldn't be a good idea
Lets see... Playing devils advocate on any topic can extend a conversation ... with the right topic it can make it run into perpetuity
Topics that never end - or potentially never end...
The meaning of life
Which religion if any is the REAL religion lol
The Universe - what is it, how big is it, is there an end? Can anything go one forever?
There is also Lamb chops song... This is the song that never end, yes it goes on and on my friend, some people started singing it not knowing what it was and they'll continue singing it forever just because, this is the song that ... well you get the jist... and if you know that song lol is it now stuck in your head MUGAHAHAHAHAHHAHA
Other conversations that at least FEEL like they last forever are one sided ones where someone is telling you about their day and you wish you had a spoon so you could dig your eye ball out and throw it at them due to the extreme boredom they are inflicting on you
Also there are some conversation that seem to at least come up again and again... i mean my mum used to say "if i've told you once i've told you a thousand times"
Also think about the arguments you have with your GF/BF/DH/DW whatever.. there are some that just seem like replay...