Tea
Tea achieves near-universal accessibility. It grows on six continents, costs pennies per serving, and requires only hot water and patience to prepare. From the humblest roadside chai stall in Mumbai to the grandest tearoom in London, the beverage adapts to every economic circumstance. Instant tea, though purists shudder at its mention, has made the drink available to those without time or equipment. The barrier to entry for tea consumption is effectively zero, requiring neither training, certification, nor years of physical conditioning. One simply boils water and waits.
Astronaut
Becoming an astronaut represents one of humanity's most exclusive achievements. Candidates require advanced degrees, typically in engineering or science, followed by years of professional experience. Physical requirements eliminate the majority of applicants before psychological screening begins. Training lasts between two and four years, and even then, launch opportunities are limited. The total number of people who have travelled to space amounts to approximately 600 across all of human history. For perspective, more people have served as Pope. The astronaut experience is, by design, the opposite of accessible.