It's not because of anything he's done on the field, though. It's based purely on how he expresses joy.
Phillips' teammates have found out that the 21-year-old has one of the craziest laughs you will ever hear or see. So, of course, they have to do whatever they can to get him to bust a gut, even if it means having "Mom Joke Mondays":
Talk about a wild laugh.
The outfielder surely wishes he was...