What was the most impressive single line of code?

  life ← {⊃1 ⍵ ∨.∧ 3 4 = +/ +⌿ ¯1 0 1 ∘.⊖ ¯1 0 1 ⌽¨ ⊂⍵}

(https://youtu.be/a9xAKttWgP4?si=jNpBdlwDyTQi34-8)

The Fast Inverse Square Root function from Quake III:

    i  = 0x5f3759df - ( i >> 1 );               // what the fuck?

https://en.wikipedia.org/wiki/Fast_inverse_square_root

Here is one with a negative impact

https://users.csc.calpoly.edu/~jdalbey/SWE/Papers/att_collap...

     ping -l 65510 0.0.0.0

or

     ' OR '1'='1'; --