The bartender, being a planeswalker on the side, requests that the jellyfish pilot the skyship for his amusement. The jellyfish replies "Hey, don't look at me. I'm just a jellyfish. I have no idea how to drive that thing."
The bartender nods, seeming disappointed. Then, after a moment's deliberation, he hands the jellyfish the shard of broken glass.
"Thanks," replies the jellyfish, wielding it expertly. "In fact, you know what, I think that I can pilot that ship... so long as I have this, anyway." Immediately, it climbs into the flagship and starts its engine. Reaching in after it, the bartender takes the shard of broken glass back.
"Keep it," replies the jellyfish. "Now that this baby's started I'm sure I can still pilot this thing."
The bartender then gives the shard of broken glass to the ship itself, which also wields it expertly. Taping the shard of glass to the hull of the titanic, flying, magic-shooting skyship improves its firepower by over 15%. The bartender is so amused by the absurdity of the situation that he doubles over in laughter, but in doing so he accidentally releases an errant bolt of lightning, killing the jellyfish pilot immediately.
"Worry not," says the ghost of the jellyfish's now-cooling corpse. "When I set my mind to something I'm gonna do it, and not even death will stop me. I'll pilot this here ship one final time from beyond the grave if I have to." The flagship then takes off, to the bartender's immense satisfaction.
Having watched the entire exchange from across the room, a mindless null shambles up to the bar. "Hey," says the mindless null, being completely mindless and having zero capacity for thought, speech or purposeful action. "That was quite the sight. Listen, I'm an aspiring pilot myself, but I see you're fresh out of shards of broken glass. Is there any way you can help me pilot that giant skyship once the dead jellyfish brings it back?"
Without a word, the bartender takes out a chariot.
