Clutching my phone and hyperventilating, I call John. ‘Help,’ I whisper under my breath, ‘I need help.’ ‘What’s the matter?’ ‘There’s too much gravy.’ ‘OK. What do you mean?’ I take a step back, banging into a trolley, and take in the full, eye-blistering, mind melting array of gravy options. I’m powerless, my brain pulling …