three is a crowd?

I have an ongoing(it rolls forward each year -almost akin to a bad & doubtful debt ) Enquiry into threesomes- I wonder if three people can really ever become good friends in an equal measure. There is a saying in Russia,"Three people can keep a secret if two of them are dead." Here,a casual after dinner walk with three good friends,turned into an excellent sketch,as one continues to walk ,whilst the other two, curious,paused and looked back.