I have been plagued my entire life with the problem of inappropriate laughter. I laugh at the worst possible times, usually when something bad or tragic has happened. All through school I laughed my way to the principal's office, and later when my children got into trouble (rarely, thankfully) I continued to laugh in the principal's office. It makes me appear reckless, callous, shallow, insincere and uncaring but that's not how I feel inside. I never understood why I laugh like that but I have met other people with the same problem. It's gotten me into a good deal of trouble too but thankfully it's been easier to control as I get older.
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"Patterns are set in one place and time, to be followed to the end of all years to come". (Andre Norton)