Singing in the shower is all fun and games until you get shampoo in your mouth. Then it becomes a soap opera.
Chopsticks what NOT todo. But we sometime do... especially "Shoveling with tamago gohan", "Resting", "skewering" ect. But definitely don't do "Standing" and "Transferring". That is what only we do on funeral. やってはいけないお箸のマナー