What was your first successful sweep? What is your favorite now?

The first sweep I was taught was a scissor sweep, which I've honestly struggled with in live rolls because I think I'm a bit too slow with it and everyone at my gym sees it coming a mile away.

The other night, I hit a perfect butterfly sweep on a blue belt who normally smashes me, and god damn did it feel nice. Curious what others had success with at the beginning of their journey.