I know a number of people at Uni who's parents are teachers.
They are all either slightly autistic, manic depressives or general social retards.
They all seem to have highly-skewed perceptions of reality and find it near-impossible to cope in normal social situations.
They're prone to suddenly just flipping out and losing the plot and upsetting the sane people who are with them.
If anyone's planning on starting a family any time soon - make sure you're not a teacher, or else your kids will grow up to be lunatics.