1 Spanners: I see you've picked up a mammal.
2 Serron: It's a cat!
2 Spanners: All mammals look the same to me.
3 Iki Piki: Well he seems to like you a lot better than Serron.
3 Serron: Can't imagine why.
4 Spanners: Hand me that hyper-wrench. I've calculated that a small adjustment to the engine fusion conduits will optimise our reaction cross-section.
4 Cat: Me-ow!

This is about the most extreme version of "All X look the same to me" that I've ever come across.