Killer Pogo Joke

Killer Pogo Joke:
.
.
Teacher: why did you
laugh.? 
.
.
Boy: I saw a strap of
your bra.
.
.
Teacher: GET OUT.
No class for you
for a week.
..
Another boy laughs.
Teacher: why did you
laugh?
.
.
Boy: I saw both
straps.
Teacher: GET OUT.
No class for you
for a month.
..
She bends down to
pick a chalk
and little Johnny
starts walking
out.
..
Teacher: Johnny why
are you
going out.?
.
.
Johnny: with what I
saw I think
my school days are
over..
..