Bad Words

A friend of mine has recently had some trouble with her son swearing. She believes he has picked it up from kindy. So knowing this was a problem in Matthew's class but never having heard any swear words coming from Matthew I asked him "Matthew does anyone say bad words at school?" He replied "Billy says fu#@er all the time." (not his real name!) He then continues eating!!!!! Like it was no big deal! But the very good news is that Matthew knows it is a very bad word and he's not to say it! Ever! Unless he wants his mouth washed out with soap!