zipper

A young, attractive woman was sitting in the buss with a thight little miniskirt.

When it came her turn to stand up she onticed that the zipper was stuck on something. 

She decided carefully try to open the zipper without anyone noticing sliding her hands behind her and slowly opeining the zipper a bit.

She tried to stand up but the zipper's still stuck.

Frustrated she decides to open it all the way and yet again slides her hands behind her.

Suddenly a man sitting behind her grabs her thights from behind. The woman get's in a schock and askes the man

"what on earth are you thinking you are doing?"

"you started," said the man, "you've already twize opened my zipper."