There are plenty of conflicts that can cause a rift in adult friendships, but perhaps the most common one is money. Obviously, there are other worthy candidates such as difficulty with communication, differences in ideologies, and disagreements about significant others. However, how people deal with money can bring about cringeworthy interactions, upsetting revelations, and disturbing differences in opinion. For instance, here we have an adult male and his wife who were invited to their friend'…