I'll Take care of it - You swear you'll handle everything, but then you do the oppo

You swear you'll handle everything, but then you do the opposite and make it worse.

'I'll take care of the chores', made a mess and left it for everyone else.

'I'll take care of the test', failed and laughed about it.

'I'll take care of the project', messed it up and got everyone in trouble.