Thunderball (1965). The fourth Bond movie, after Dr. No, From Russia with Love, and Goldfinger. The first two Bond movies were successful enough, but Goldfinger was a huge hit, earning almost $125 million in 1964. So when it came time for Thunderball, perhaps they were more willing to spend money; it cost more to make than all three previous Bond movies combined. Probably owing to all the underwater scenes.
By this point they had the formula down, and Thunderball is terrific fun. Not quite as good as the earlier ones, but still one of the top ten Bond flicks in my book. I probably watched this when I was a much younger fellow, but so long ago that I don't remember it - whereas I've seen Dr. No, From Russia with Love, and Goldfinger relatively recently. It turns out that Amazon Prime Video has decided to provide all the Bond movies commercial free, so I may well revisit some of them, or even watch the few I've skipped entirely. Hot women, guns, chases, cool gadgets, and of course explosions: Bond movies are quintessential guy movies.