[action] you called for sappy music?
[Quiet music wafts up from a corner where WALL-E has tucked himself into his box and out of sight. They may recognize it as a song from Hello Dolly. Other than the music, WALL-E is keeping veeery quiet and still to not interrupt their evening! And he even had EVE help him wash up for the occasion, so the box they might spot is not a grungy one!]