Do you have your favourite affix (prefix, infix,suffix) in English?

My favourite affix is "holic" which can describe what kind of person I am in some way. Recently my friends keep calling me nut because I'm totally immersed in Spanish learning. When I told them maybe I need to learn some German and Italian to deepen my understanding for WWⅡ history. They just screamed and recommend to see a doc. It's just so easy for me to get addicted to something so I'm really into it. haha

 

What's your favourite? I'm quite interested!