The expert who somehow knows all things science and engineering, like they're all just basically the same. Just once I'd like to hear, "I'm an astrophysicist, not a cybersecurity expert. I don't have the first clue where to begin hacking any computer, let alone an alien one that I've never seen before."

Bonus points if the characters have to look for a different solution due to their lack of on-hand expertise in a particular area.