There's not a more dysfunctional, over the top, and extra friend group than the Gang from It's Always Sunny In Philadelphia. This group is loud and in your face, but they do a great job of keeping us entertained throughout this 11 season show. I'm not really sure if any of these characters actually did go to college, but if they did, here's what majors they would have.
Dennis Reynolds: Psychology
Dennis is the only character who we know graduated from college with a degree: Psychology. He constantly tries to analyze the behavior of his friends throughout any situation they go through and is the leader whenever someone needs an intervention. Dennis clearly uses his college degree in every aspect except his professional life, but we'll give him credit anyways.
Mac: Economics/Entrepreneurship
Financial crisis? Mac is your guy. Whether it's selling gasoline to people or creating Paddy's Dollars for the bar, Mac always has an idea on how to make more money dollars for the bar. Not to mention, he is a very smooth guy and has a way of getting what he wants throughout the show. His use of economics combined with his charm make him one of the most important members of the gang and would probably make him an excellent entrepreneur if given the chance.
Deandra "Sweet Dee" Reynolds: Theatre/Drama
Not only is being an actress Dee's dream, but she takes every chance she gets to prove how dedicated to the field she is. She creates her own characters, stars in musicals, and does terrible stand up comedy just to try and get some sort of acting gig and although it doesn't work out most of the time, we admire her persistence. Dee Reynolds is a fierce young woman who isn't afraid to put herself out there which is why she would be a theatre major.
Charlie Kelly: Create Your Own Major
To be honest, we don't really know what's going on with Charlie Kelly. He's a wildcard, the odd one of the group, and we're about 90% sure he does not know how to read or write. He doesn't fit under one particular field of study, so we gave him the "create your own major" path so he can figure it out on his own.
Frank Reynolds: Business
Frank is the business leader of the group. He makes all the decisions about money, what to buy, and how to further the success of Paddy's Pub. There's just one thing: he's not very good at it. Frank is along for the ride because of his large sum of money that the gang mooches off of, but we learn to love and accept Frank as one of the group. He would be a business major because of his familiarity with the industry and ambition to start new business projects, no matter if he fails.
The Waitress: Hospitality Management
And lastly, we have The Waitress. Naturally, she gets a degree in Hospitality Management for her interaction and services that she provides her customers. Sometimes she isn't the nicest or friendliest, but she is very dedicated to her job and serving others to the best of her ability. Everyone but Charlie that is.