I had to force myself to laugh , and there were about 3 - 4 Brown Bag fouls . Everyone 's minds were in the gutter . It was ridiculous .
According to the above context, choose the best option to answer the following question.
Question: Why might have I forced myself to laugh ?
Options:
- Because i do usually enjoy clean jokes .
 - Because i do usually enjoy dirty jokes .
 - Because i do n't usually enjoy clean jokes .
 - Because i do n't usually enjoy dirty jokes .


Because i do n't usually enjoy dirty jokes .