The Monty Hall problem explained

When I was in college, we discussed this problem in Critical Thinking.  It showed how we are not always so good when it comes to estimating the probability of things.  This YouTube video explains it well though.  Even though the announcer is a bit weird, haha.  I have tried to explain why its not 50/50 in regards to staying or switching to several people unsuccessfully.  So this is helpful!