Not always your first, but the first flower you have seen! Frailea flowers tend to be fairly fleeting and unless you go into the greenhouse or where they are at the right time you can often miss them. In habitat they often grow among moss in quite damp conditions at certain times.
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Many say they open their flowers only when it is hot and sunny, but to quote the Brazilian botanist Marlon Machado:-
"Fraileas don't often open their flowers, but you stand the best chance of seeing them with their gorgeous, golden flowers open in the heat of high summer, after a watering early in the day so that the humidity is high, and even better if the weather itself is thundery and sultry. Mid-afternoon is when you are most likely to find them open."
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If you are out at work all day you can often miss them, that is unless they flower at the weekend.