Dang, thought it was a chemistry question!

We are picky about who we ask along on a trip.  For us, a canoe trip is like going to the moon:  Once on your way you're pretty much stuck...Any personality conflicts ought to be sussed out before the trip starts.

We tell friends stories of our trips, show pictures, wave our hands frantically, and they are usually interested until they find that it involves some effort.  That shortens the list dramatically.  Then, of the few who continue to show any interest we consult on who we'd like to come along.  Some folks would be a disaster in the woods (at least with us.)    Usually what stops them next is the availability of vacation time.  The final hurdle is "Do they snore? (or are they indifferent to others' snoring?)"

Stumpy's travails with his crew for the BWR come to mind on being ambushed with a contrary attitude in the midst of a trip.  For us, that would be an invitation to tie that person up and leave him on a rock. :o