tell me something emberrasing that happend to あなた または to someone else

ok,here's my story:
some months 前 i saw a man on the 通り, ストリート (while i was going somewhere) & i though he was my cousin & i start talking to him,he had no idea who was i & i was thinking "is he stupid または what,he doesn't know me???"..some mintues later i understood that he wasn't my cousin,i was talking to a strange man...OMG it was so emberrasing,i was so stupid,then i 発言しました "good day"& i left
but i have never seen a person so "look-alike"with my cousin

& something もっと見る emberrasing that happened to my friend
he was in class & here comes this guy who strip (or how should i say?) his pants off..he was totally naked in the middle of the class