Just had a spontaneous thought while stocking bell peppers. I have no idea where it came from or even how it came into being.
At the end of Chrono Trigger, Robo has to return into the portal to 2300. "Lucca, it is you who have taught me these emotions. Thank you." He climbs onto the portal, and as the timegate closes over him, leaving only his arm sticking out, he gives the thumbs up.