VORTIME.
eeek. Sorry to hear about that flight....youd be amazed at how many PPLs/CPLs believe they are an instructor..
Did you know the guy on the ground much before hand? if not my recommendation is get to know someone a little before flying with them - or get a recommendation from someone who has flown with them...ask people what they are like. Was there a large age difference? Just curious.
Give a captains brief on departure - make sure they KNOW you are PIC and have the controls and they should NOT touch anything unless asked to do so.
More importantly NEVER let them ride the controls - ESPECIALLY the rudder pedals - you cant see them so this makes it harder...I was flying with an instructor once who forgot he was on the pedals (we thats what he told me) I gave them a kick to find no movement - lots of apologies and one retracted leg later the pedals moved again!!! Taught me a valuable lesson though...if you dont know where the feet of the peeps next to you are then you may find out at a critical moment...
The worst time for me as an instructor has been on those flights where i really do wish to just go along as pax and ENJOY it - Im so busy normallyinstructing/flying myself its nice to sit back relax and ENJOY the flight. The worse has been going flying with someone you have just done a club check on...its very hard to switch instuctor mode off - but im learning and my 'students' have been very understanding - they are all excellent peeps anyway! At least as an instructor i know where to keep my hands! (firmly in my lap and NOT on the controls...)
Hope you find a more aimiable friend to fly with - may I suggest that what you need is not someone greatly more experienced than you - but slightly more experienced...thus avoiding know-it-all syndrome (well sort of)...
Hope this helps,
FF