People who stutter often have "internal rules." An example that pertains to voicemail on a phone would be: "I can't leave a stutter on someone's voicemail!" Or, "my personal greeting cannot have a stutter!" Another, "during an interview I cannot have blocks!...if I do, I won't be hired...little stutters are OK but not blocks!" A rule book for stuttering doesn't exist, does it. We can feel so sure about these irrational beliefs. Personalizing and/or projecting are the real culprits behind internal rules.