1. Se + indirect object pronouns

2. To express unintentional events in English, people might say:
The pizza (got) burned. (instead of I burned the pizza.)
In Spanish, people say: 
Se me quemó la pizza. (instead of Quemé la pizza. )
In English, the possessive adjective is often used.
My books fell.
In Spanish, the definite article is used.
Se me cayeron los libros.

3. Se + indirect object pronouns
Use se + indirect object pronoun + verb to talk about unintentional events.
A Julia se le olvidaron las bebidas.
Julia forgot the drinks.
A José se le cayó el libro.
José dropped the book.
The indirect object pronoun refers to the person the event happened to. The verb agrees with the object(s) involved, and is always in the third person singular or plural.

4. Se + indirect object pronouns
Common verbs used in this construction are quedar, quemar, perder, olvidar, caer, romper, and acabar.
Se me rompieron los vasos.
I broke the glasses.