Define regression toward the mean. Explain how regression toward the mean can describe two friends who have a fight then later go the movies together.

Regression towards the mean is a condition in statistics that is not purely based on factual data rather it involves such events that the results generate on the basis of a chance. So one can entirely not predict with certainty the results in regression towards mean

Now in the given conditions of question statement, it is possible that the two friends would think that they over reacted in the fight and so to make up for this, they end up in watching a movie together.