Sometimes I see people on the internet saying something like "Me has a box" "Me does the job", or "I has a box" (or even "I haz a box"). And I'm sure they do it intentionally.

Why do people refer to themselves using verbs in 3rd person while using "I" or "me" in front of them? And is there any difference between that and using it in a "correct" way (like "I have a box")?