What is the difference in meaning between I think and I am thinking in the sense of having an opinion? Grammar books say that it isn't correct to use the verb think in the present continuous in that sense, but Joey in the 22nd episode of the 6th season did exactly that. Here it is:
Well it’s just—it’s one of those situations that I just hate. Y’know? A massage client gave me three tickets to the Helmet-Pelts exhibit at the Morgan Chase museum.
Joey: (nodding knowingly) Now you’re thinking you gotta sleep with him.
How the meaning of the sentence change if he said now you think?