Charlie Sheen gives advice to students on Career Day

Charlie Sheen recently went to his daughters' elementary school to give students advice on Career Day. (Yes, you read that right.) "At the last minute, Charlie decided he wanted to go," a source says. "It was funny and Charlie answered questions from the kids about being a TV star. The talk lasted about 10 minutes and then he was gone." Ex-wife Denise Richards was also in attendance for Sheen's tutorial, but she "sat on the opposite side of the room" and didn't "exchange any words" with Sheen.