Yeah, it was indeed clearly shown for a show like this. This is so purely scene by scene constructed comedy that I find it quite surprising they introduced an element like that, which, it seems to me, doesn't have so much to do with comedy and that persisted from episode to episode. But then again, in this episode it did contribute to comedy as well, granting the opportunity to give Tsuda another vibrating present. Perhaps I judged it too harshly.