Humiliated

Angela
So, my husband and I are staying at my in laws (his parents) house for a few days while our air conditioner gets fixed. I went into the bathroom to take a shower, forgot a wash cloth and by the time I took a shower, his parents are usually gone for work so I walked out of the bathroom naked to go grab a wash cloth and just my luck, my father in law saw me completely naked! When I saw him, my naturally reaction was to cover my boobs and nothing else and screamed. 
When he got home from work, he said "nice to see you have some clothes on" and laughed. I know, I should've put a towel on, totally my fault for assuming.
My mother in law has already seen me naked in the past for just assuming, I should've learned from that time!
Has this happened to anyone else?