I Must Diff - You shout 'I Must Diff' when you're so frustrated you're rea

You shout 'I Must Diff' when you're so frustrated you're ready to throw your phone out the window.

'I Must Diff' when my friend said my dog was 'the worst dog ever.'

'I Must Diff' after my teacher said I was 'not even close to passing.'

'I Must Diff' because my mom said I was going to get grounded for a month.