First time spotting a C-17 Globemaster

This was the IAF’s C-17 Globemaster III in the skies over my hometown in India, and I assume it was on COVID duty. The week before this sighting, a USAF C-17 had landed in India, though it was seemingly not in my hometown.

My reactions when I spotted it:
What the fuck is a small dark cloud doing in this weather? -> Wait, why is it moving so fast? (Too slow for a plane, but way too fast for a cloud.) -> Hold on… why is it so symmetrical? -> Wait a second, that actually looks like a plane. -> Oh, it is a plane! -> Quick, shoot, shoot, shoot before it’s gone!