Looking on the internet deeply has found these results:

You think so? is the most popular phrase on the web.

To entertain us. 1448,000 results on the web	You think so? 135,400,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
He's sort of a magician, and he's going to entertain us, hopefully. Carlo wants us to entertain them. Richard Lewis came to entertain us. A couple of employees have volunteered to entertain us with a song. The purpose of this exercise is not to entertain us. it's your turn to entertain us. Τhere's so little to entertain us here. He's sort of a magician, and he's going to entertain us, hopefully.	The wife said, "You should say goodbye." I said, "You think so?" Do you think so? Well, he is certainly not to be sneezed at, don't you think so? With her, the most unworldly husband would automatically take a prominent position in society, don't you think so? Remarkable way of getting on an aircraft, don't you think so? Anyway, I'm sure Manager Seo has come to her senses, don't you think so? Yes, believe me. She's quite difficult to be with, don't you think so?

To entertain us.

1448,000 results on the web

You think so?

135,400,000 results on the web

More popular!

The wife said, "You should say goodbye." I said, "You think so?"
Do you think so?
Well, he is certainly not to be sneezed at, don't you think so?
With her, the most unworldly husband would automatically take a prominent position in society, don't you think so?
Remarkable way of getting on an aircraft, don't you think so?
Anyway, I'm sure Manager Seo has come to her senses, don't you think so?
Yes, believe me.
She's quite difficult to be with, don't you think so?