Sudden unintended acceleration (SUA) could theoretically happen due to electronic control system errors. However, based on basic automotive engineering principles, braking force is much stronger than the engine's maximum output. In other words, even if the engine goes out of control and hits 100% output while pinning the RPM needle, the car physically MUST stop if the driver slams on the brakes. Also, since the braking system is an independent, mechanical hydraulic system that operates regardless of electronics, it will function normally even if the engine is racing due to an electronic glitch. Considering this engineering design and the mechanical mechanism of the hydraulic system, it's impossible for a car not to stop if the brakes are actually applied. If a car really didn't stop despite braking, it would mean it's a complex accident combining both SUA AND brake failure, and there's no reason that couldn't be proven. Therefore, it's safe to conclude that all accidents caused by sudden acceleration are pedal misapplication accidents.