. . . And Then I Started Laughing

In Portuguese class, learning reflexive verbs.  Me lavo o cabelo.  I wash my hair.  Except I don't wash my hair every day (as the little communicative activity in the book assumed) because my hair é diferente.  So, I began attempting to explain to my classmates with whom I was completing the communicative activity (owners of non-Negroid hair) why.  You know that feeling when you feel that all eyes are on you right before you look around?  I felt that, and I realized the rest of the class (not in my group, yet also owners of non-Negroid hair) were hanging on my every word . . . and then I started laughing.