Place it near the end of a short random-reaction edit, after the visual payoff has landed. Follow it with the Bruh sound for a second reaction, or open with Goofy Ahh Sounds to set up the randomness before the banana line arrives.
About this sound
A short, low-quality voice-changed clip lasting about three and a half seconds, centred on the phrase pretty cool bananas for no apparent reason. The distorted delivery turns an ordinary compliment about bananas into something deliberately silly and offbeat, and the randomness is the whole appeal: it feels like a throwaway line that lands because it makes no sense at all.