P-hub fallacy
You catch someone doing something they shouldn’t be doing, but you’re just as guilty and it all ends up being very awkward.
"You're cheating on your math test?" I said. Then I remembered I had a cheat sheet under my desk.
"You're sneaking out at midnight?" I said. Then I remembered I was wearing my pajamas and had a flashlight in my hand.
"You're texting in class?" I said. Then I remembered I had my phone out too."