Think hard . . . what's your very first childhood memory?  If you're like one-third of people, your first memory is having a stranger brutally torture you for your own good . . . and your parents PAID for it.

In a new poll from of 1,671 people by the website, 35% of people say their earliest memory is a TRIP TO THE DENTIST.  And almost all of them say that they think the FEAR and PAIN are what made the memory stick.

The average age for people's earliest memory is about 4.3 years old.  Here's the full top 10 list of people's earliest memories . . .

#1.)  Trip to the dentist

#2.)  Birthday party

#3.)  Vacation

#4.)  First day of school

#5.)  Trip to the doctor

#6.)  Being outside

#7.)  An accident or injury

#8.)  A tooth falling out

#9.)  Receiving a present

#10.)  Playing with friends