Mulla Nasrudin

I did not start it

   Nasrudin went to a mosque and sat down. His shirt
was rather short and the man behind him pulled it
lower, thinking it looked unseemly.
   Nasrudin immediately pulled on the shirt of the man  
in front of him.
   ‘What are you doing?’ asked the man in front.
   ‘Don’t ask me. Ask the man behind - he started it.’