#llm didn't really get it:

Ahah! That's a clever and humorous drawing! Here's why:

1. **Misdirection**: The setup is innocent and casual, with two unicorns chatting on a boat. The reader expects a lighthearted conversation.

2. **Ordinary names**: The unicorns introduce themselves with mundane names, "Dave" and "Robert", which adds to the humor. Who expects unicorns to have such ordinary names?

3. **The punchline**: The second unicorn, Robert, suddenly exclaims "Oh crap" after introducing himself. This reaction implies that something is terribly wrong.

4. **The unexpected twist**: The boat is revealed to be Noah's Ark, which changes everything. The unicorns, being mythical creatures, shouldn't be on the Ark, as it's meant to save real animals from the Great Flood.

5. **The humor**: The humor comes from the absurdity of the situation. Robert's "Oh crap" is a hilarious reaction to realizing they're on the wrong boat, and their species isn't supposed to be there. It's like they're "stowaways" on the Ark!

The drawing is funny because it cleverly subverts expectations, using a unexpected twist to create humor. The contrast between the casual introduction and the sudden panic is what makes it amusing.