Dirty Jokes - I thought we was aquainted

This lady that was wearing a tight
skirt was waiting at the bus stop
to get onto the bus. A bus pulled up
and the driver opened the doors.
she tried to step up onto the step
but her skirt was too tight.
So she reached back to unzip and
loosen it a little. she tried to step up
onto the steps again. But it was still to tight.
She reached back and unzipped some more.
Tried to step up again and
the skirt was still to tight.
She tried one more time.
She reached back and unzipped some more.
And she still couldn,t get up onto the bus.
So this man behind her reaches
and grabs her by the butt. He gives her
a boost onto the bus. She turns around
and slaps him and saying
"What do you think you are doing."
Well the man says "Well lady after you
unzipped my pants for the third time
I thought we was aquainted."