Though being completely immature will probably have adverse effects on your social life, education, and life in general it'll be more fun!
John: Yeah? Well...you've got herpes!
Zoe: This is why I'm breaking up with you! You're so god damned immature!
John: At least I don't smell bad!
2. Bob: I'm sorry Karl...your...well...your dog died.
Karl: Oh...well...YOU LIKE MEN!!! MAAAN LOVVEEERR
Bob: Wow. Your immaturity was so bad I might have to jump out of a window.