Thank God It's Friday

A nun and a biker were standing in an elevator. Being the nice person that she was she looked over at him, smiled and said:

"T. G. I. F."

The biker looked back at her and said:

"S. H. I. T"

The nun was shocked. She turned to the biker and said:

"There was no reason to be rude, all I said was "Thank God It's Friday".

The biker looked back at her and said:

"Well you must have misunderstood me because all I said was, "Sorry Honey It's Thursday"