Pizza
Pizza achieves near-perfect accessibility. It can be found in villages and metropolises, purchased for prices ranging from a few pounds to somewhat more than that at fashionable establishments. One need not speak the local language to order pizza; a pointed finger and minimal gesturing generally suffice. Pizza adapts to virtually every dietary restriction through thoughtful topping selection: vegetarian, vegan, gluten-free variants exist in abundance. The frozen pizza section of any supermarket ensures that pizza remains available even in the most remote locations. One can make pizza at home with basic ingredients and rudimentary skills. The barriers to pizza access are functionally non-existent for most of humanity.
Astronaut
Becoming an astronaut represents one of human civilisation's most exclusive achievements. NASA typically receives over 18,000 applications for each astronaut class, selecting perhaps a dozen candidates. These chosen few must possess advanced degrees (typically in engineering, science, or medicine), thousands of hours of flight experience, and near-perfect physical health. They must pass psychological evaluations designed to identify those capable of maintaining composure whilst strapped to controlled explosions. Even meeting an astronaut proves challenging for most civilians. They number fewer than members of most professions, scattered across space agencies worldwide. Accessibility, it must be concluded, is not the astronaut's strong suit.