"pensar" v "pensarse"
I came across the following in an article:
(Context: two friends going to a Mexican restaurant & talking to restaurant owner (Gastón), one friend (Lucas) trying to convince the other (Eduardo) to be more open minded about Mexican food)
Lucas: "Este amigo mío se piensa que la comida mexicana está compuesta solamente de tacos y tortillas. ¡A ver si lo educas un poco!"
Gastón se ríe.
Gastón: "¡Faltaba más! Con mucho gusto. Siéntense que les sirvo algo bien sabroso y especial."
I question why Lucas doesn't say, "Este amigo mío piensa que..." i.e., He thinks that... Why does he say "se piensa"?
2 Answers
It's said that way when you want to express that what the other person thinks or believes is obviously wrong.
Examples:
- Él se cree el mejor jugador del mundo.
>>> He believes he's the best player in the world.
- Se piensa que le van a vender un auto nuevo por mil dólares.
>>>
He thinks they're going to sell him a new car for one thousand dollars.
I'm sorry I can't help you with grammar rules.
To me it just sounds like bad Spanish. The only time "pensar" would be use reflexively is to translate an English passive. It is thought that---- Se piensa que. Even that is not too cool.
The first sentence should be "Este amigo mío cree que" ---then the rest of the sentence.