Any idea what's causing these circles in my gravel driveway?

   / Any idea what's causing these circles in my gravel driveway? #31  
I’m not ruling anything out including my all time favorite... Poltergeists!!!!

actually, my first thought upon viewing the pics was a bird dusting itself. Other suggestions also make sense... aliens break dancing?
 
   / Any idea what's causing these circles in my gravel driveway? #32  
I’d be more inclined to say birds vs a vehicle. Maybe kids and a leaf blower?
 
   / Any idea what's causing these circles in my gravel driveway? #33  
Animal urine after urine has evaporated?
 
   / Any idea what's causing these circles in my gravel driveway? #34  
My freightliner air brake release often made spots like that in loose gravel.
 
   / Any idea what's causing these circles in my gravel driveway? #36  
It’s from the exhaust turn down on a 1969 Plymouth Satellite, 383 2 barrel, bias ply tires, 4 door, white with a black interior, 727 torqueflite transmission, 180 pound driver, the spare tire is missing from the truck.
 
   / Any idea what's causing these circles in my gravel driveway? #38  
Maybe a Wolverine urinated in the "O's" in Ohio last Saturday?:ROFLMAO:
 
   / Any idea what's causing these circles in my gravel driveway? #39  
It’s from the exhaust turn down on a 1969 Plymouth Satellite, 383 2 barrel, bias ply tires, 4 door, white with a black interior, 727 torqueflite transmission, 180 pound driver, the spare tire is missing from the truck.
Is this an admission? 😂
 
   / Any idea what's causing these circles in my gravel driveway? #40  
It’s from the exhaust turn down on a 1969 Plymouth Satellite, 383 2 barrel, bias ply tires, 4 door, white with a black interior, 727 torqueflite transmission, 180 pound driver, the spare tire is missing from the truck.
 

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