"But honey, I only opened WhatsApp to reply to my boss. He still forwards me every stupid joke he gets. I didn't notice your message about the dinner with your parents!"
"Oh. I thought you did and you ignored me."
"No, no, I swear. Is it too late to reschedule now? Please don't tell me that I'm missing another lovely evening with your mother!"
"See, I had a hunch that you were lying, but now I'm sure.