When I was little I had a speak and spell. You could type in a word and it would say it. Naturally we tried to get it to say things like Ass or Sh*t, but failed. It seemed to be one step ahead of us. However, there was one word which worked in every day speech that provided us with amusement for hours. One Word....BUT
And when I typed in BUTT, it would double up on the T sound.
Thank you Speak and Spell.