It is now more than a coincidence, but I have heard numerous people from different parts of the country use the words "might" and "could" together in a sentence as in:
"This might could help."
The first time I heard this, I chalked it up to a mid-sentence correction where the speaker started to say "This might help", but then changed mid-sentence to "This could help."
I've heard it now in spoken English from various people from different parts of the country. I'm curious if this is a dialect thing or if it has a name. I've also heard it repeated by the same person multiple times, both people I know and other people I don't know, so it appears not to be just a one-off mid-sentence correction, but a way of speaking that I'm not familiar with.