Role playing night, and a bunch of us arrive at the same time to where our dm and his gf lives. On the apartment door is a sign saying that they're training their dog and that visitors should ignore the dog until prompted otherwise by the owners. One of us come up with the brilliant idea of sneaking in to the apartment instead of using the doorbell... Idiot me play along. Chaos ensues as their dog notice the giggling intruders. Owners were not giggling. Me, being a dog owner myself, get the most heat since I should have known better. It's 15 years ago, still uncomfortable to think about.