Mommy: Thomas, What did you learn in science class today?

Thomas: When you put the white stuff in the H2O, it moves a little bit, but when you put the vinegar with the white stuff, its explodes like a volcano

Later when Thomas tells Daddy about science class...

Daddy: Thomas what is H2O?
Thomas: Water

While watching the show Amazing Race...

Thomas hears the host on the show say "Now the contestants are in Vietnam"

Thomas says: Mommy, you were born in Vietnam !

Thomas is in the bathroom...

He is yelling from the bathroom, after a 1st unsuccessful flush

Thomas: My poop is here again

While flushing for the 2nd time

Thomas: Don't come back again, Poop