I might be a bit of a weather nerd, but I think these are really cool

What Punched a Hole in these Clouds? - weather.com

I've been privileged enough to see mammatus clouds on multiple occasions too, very rare and only seen in an extremely unstable atmosphere.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth