Had the same thing with the Pax belt on a tommie, ...ok so sometimes i taxi a bit fast but the banging of the belt against the door forced immediate braking action, followed by panicked instrument searching and eventual rather hasty engine shutdown.
Two A/C in the taxi way behind me were surely amused when i opened the door and pulled the belt in.
Yes i've left the door open too..... easy to do on the tommie as well <sigh>