By chance, I met your brother on the street.
- Tapasin sattumalta veljesi kadulla.
I found this restaurant by chance.
- Löysin tämän ravintolan sattumalta.
I met Jane by accident.
- Tapasin Janen sattumalta.
We met them by accident at the bus terminal.
- Tapasimme heidät sattumalta linja-autoasemalla.