It's not common, but there are web APIs where you await a promise that already exists as a property, rather than being returned from a function call, like

    await document.fonts.ready

    device.lost.then(() => {
      console.log('WebGPU device lost :(')
    })

I feel like this isn't confusing if you know how promises work, but maybe it can be confusing for someone coming from Python/Rust, where async functions don't evaluate until their futures are awaited.