If this were true, no one person would remember the hypnotizing if it were a true event.
The purest truth behind being hypnotized is that someone would have to tell you that
you were in fact hypnotized directly after the event otherwise,
no one would ever believe you, your question couldn't be answered.
They would just go on with their lives as normal.
Unless of course they were directly under therapeutic care of a registered psychologist
which doesn't match your criteria.