Surprise S rank's

So basically i had a rumble game where i just got an S-, just wondering since it's now always being announced. Anyone been getting any random times where they actually managed to hit an S ranking (and were shocked at the fact)? That's my rumble S-, i felt like i was useless (still trying to learn to play him) but apparently i actually managed to do a decent amount in the end, to the point of the S-.
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