How Sandra Bullock Snuck Into Hollywood ...

Without the assistance of Keanu Reeves, Sandra Bullock made her way from Austin to L.A. for her secret appearance on the Guys Choice Awards on Saturday ... on a bus.

Eventually the bus arrived in L.A. -- and safely slowed below 50 mph -- so Sandy could transfer to a waiting car.

Luckily, there are no reports of another "Speed" sequel.