To Tell a Mortal Sabrina the Teenage Witch : Season 2 Episode 10
TV-G (some episodes) The WB 22m int(0)
Aired: November 21st, 1997 @ 8:30 PM EST on The WB
On Friday the 13th a witch can tell a mortal about being a witch because at the end of the day they will forget about their secret so Sabrina tells Valerie and Harvey.