Crosshatched waves
When you see a weird, perfectly-square wave pattern in the sea, more than likely there’s a rip current lurking beneath the water’s surface. And they’re immensely dangerous. Rip currents are responsible for the death of over 100 people yearly in the U.S. This pattern occurs when 2 current systems run into each other — or when the wind pushes waves in one direction and the underwater current pushes them in another.
What to do: Stay away from the water! Rip currents are powerful enough to pull a person out to sea and drown them. If you ever get caught in one, swim parallel to the shore to break out of the pattern, and then at an angle to the shore.
Sauce: https://www.iflscience.com/environment/what-could-have-caused-polands-crooked-fo
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#11 and #12 This is not how a sun flare looks like.
#2 What to do? Rush outside and stand where the lightning is most concentrated, preferably holding something metal above your head.
#3 What to do? Run into the water and dive down as far as possible to warn the fish of the dangerous currents.
#4 What to do? If wild animals are acting strangely indoors, let them outside before they poop.
#5 What to do? Stop what you're doing and immediately take a selfie.
#6 What to do? Run directly at the funnel, waving your arms to dissipate the cloud.
#7 What to do? Immediately tell your neighbors the moon told you it's going to rain in 2 days.
#8 What to do? Stand your ground and push the waves back with your hands.
#9 What to do? Run directly into the wall of flames so you can come out on the other side all the quicker.
#10 What to do? Take a really big breath and blow the snow back as hard as you can, creating a break in the avalanche and making it flow around you.
#11 # 12 What to do? Something is wrong with the sun. An expanding wave of cosmic nuclear fire will soon obliterate the solar system. UV blocker 50 should handle it.
In other words, avoid dangerous things as quickly as possible! DUUUUUHHHH!!!