He likes the breadboard more than you. I, on the other hand, have not found a breadboard I'm so enamored with. There's always some holes that hold the pins too loosely. You just can't trust the connections.

If there was ever a person or family that needed professional counseling it’s this one… OP your previous apparent suicide attempt - What was your primary motivation? Was it because your emotional pain was so bad that you thought dying sounded better? Or were you trying to get Dad’s attention - You don’t have to tell us or me but you really need to be honest with yourself. From what you said it sounded like your Dad didn’t think you would actually do it and was in some way possibly trying to discourage you from using this as an attention getting episode if that’s what he thought it was… I am definitely not trying to defend your dad, I am just trying to explain why he might have reacted that way. Obviously it was a bad call on his part all the way around. And depending on what else was going on when you attacked the breadboard with a knife, it might have been more than he could handle… OP all I can say for sure is that for your own sake you need professional counseling. I am no psychologist, but this is not safe or healthy behavior. And Dad probably needs some kind of family counseling at the very least… Unfortunately the holidays can be stressful for many people. Life is not like a show on the Hallmark channel where everyone finds love and acceptance in the end. Often the difference between how we and our culture have idealized certain seasons and holidays, and the reality of our lives can be painful. Furthermore these are times of great uncertainties and that affects people’s stress levels. OP, you really need professional mental health counseling as does your Dad. Please check out the options you have. You can start with your family doctor, a school counselor, or even a suicide help line (those are not a long term fix, at best they point you in the direction you need to go, at worst it’s someone to talk to for a little while).

I would say this is fairly understandable. You crossed the line from hurting yourself to lashing out at something else, in anger, with a knife. Your father doesn't value the breadboard more than you, he knows that next time it might not be the breadboard, it might be the dog, or it might be him. Believe me because I've been there, he didn't leave because he was upset about a breadboard, he left because he was terrified.