I've been approached a couple times but never tried it. I've seen too many cartoons about who the people really are (i.e. men posing as women, vise-versa, 14yr olds, etc) to really get into it. Even if I knew the person how am I going to type fast enough with one hand? Seems too distracting.

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"Old man, how is it that you can hear these things?

Young man, how is it that you do not?"