Sometimes I sits and thinks

I've recently heard my teacher saying a quotte 'Sometimes I sits and thinks, and sometimes I just sits'. I was wondering is it possible to use the -s suffix for the first person singular and in what context? well the teacher insisted that it may be used when the speaker uses it to make a effect on the audience. Unfortunatelly didn't mention what kind of effect, so maybe you could help?
I would be grateful!
thanks!

"I sits" and "I thinks" are characteristic of various regional dialects in English. The effect is of a folksy, rustic utterance. I would suggest that it should only be used by someone who is actually familiar with rustic dialects.