During my Japanese 2 class, I had my students memorize a dialog and present it to the class. Three students approached me and asked if they could work in a group of three to memorize it. I would have protested, but they were all good, hardworking students, so I let them go ahead, even though the dialog only had two parts (thus, a dialog). I stopped by as I was walking around the class, helping everyone out, and asked how they were doing. The boy in the group (who was working with two girls) simply said, "This threesome is working out great."
He didn't even intend any innuendo. No one giggled or said anything inappropriate. I'm so used to hearing kids search for any trace of entendre in everything they say that it caught me off guard a little. Way to go.