Okay, the user said, "My hovercraft is full of eels." That's a classic line from the song "The Twelve Days of Christmas" parody. Let me think about how to respond.

First, I should acknowledge the reference. It's a well-known joke, so pointing that out makes sense. Maybe start with something like, "Ah, the classic line from the song..." to show I get the reference.

Then, I can add a bit of humor or a follow-up question. Since hovercrafts and eels are unusual together, maybe ask if they're planning a voyage or if they need help. That keeps the conversation engaging.

Also, I should keep the tone friendly and playful, matching the lighthearted nature of the original line. Maybe throw in an emoji to keep it casual. Let me make sure the response is concise but covers the acknowledgment, humor, and an invitation for further interaction.