Telling yourself that you will eventually fall over because of clipless pedals increases the likelihood that it will happen. Self-fulfilling prophecy.
Doesn't happen to everyone. I've been lucky enough - knock on wood - to have never had a clipless-related fall. Switched to SPD in 1998. Knock on wood.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer