What would happen if you wrote a check to yourself and then deposited it into the same account you had written it from? (I could use an ATM to avoid interacting with a teller who will likely question this.)
What if the check is for more than the account balance? If I have $100 in my account, I can't normally write a $1,000 check, but $100-$1000+$1000=$100.
I have no need to do this, but I'm just curious what would happen.