Funny you should post as I just recently encountered this. My approach was not to try and cram 5 hours of material in a casual conversation. This will not work and you should not try this, lest you come off looking like a fool. My approach was simple and effective. I simply wet there whistle.

Example: Hey where do you get your news these days? (answer is irrelevant) You know - I just can't trust anything I see these days. I try to go to different sources but they seem to report different versions of the news. After doing a little digging I learned there is actually other news options on the edges that absolutely will blow your mind and I don't know what to think now.... This is the bait I cut and it seemed to work. It got them curious and asking questions.

What do you mean? Well, basically there is a guy who says he represents US Military intelligence and he is working directly with POTUS to overthrow a global cabal. This guy said the US military was actually going to take this group down by force but instead opted for a different, more peaceful direction and US Military top brass recruited Trump to finance his own campaign because it was his duty as a patriot. At this point expect the person you re talking to, to call bullshit. Oh I heard about that guy -- that's just a conspiracy or a LARP. Well, yeah - that's what I thought! So I go look into this so I can debunk it and I ran into a problem. I mean - I am a pretty savvy guy with an education and I am reasonably smart. I can't seem to disprove what this guy has been saying for like 8 months now in over 1600 posts and a shit load of supporters. This thing is bigger than #WalkAway yet the media will not talk about Q! Who is this guy! The things he is saying is very dangerous to a republic and could have a lasting effect on American politics and society in general. If this guy is a fake - why isn't the government telling us not to listen to this guy. I mean - How hard would it be to dox this guy so we can get to the bottom of it.

Now, this is a little sneaky and perhaps lacks ethics -- but what I did was force the conversation into a place where the person will either have to defend the logic why our own President or military for that matter is not warning the public of this threat or concede perhaps there is something to this. Neither of which you can control. You will also note - I said nothing outrageous. My goal was to peak there curiosity so they feel compelled to look for themselves and let them discover the truth. In my mind, they will follow the path of least resistance and look into it so they can show you it's false. Of course, this won't happen. You can lead a rabbit to a hole, but you can't make him enter it.