Is this the weirdest thing in C? (craftofcoding.wordpress.com)

This weirdest thing has been a staple of entries in the IOCCC [1]. It is used not only to obfuscate, but also to save characters. For example, in this 1989 arbitrary length maze generator submission

    char*M,A,Z,E=40,J[40],T[40];main(C){for(*J=A=scanf(M="%d",&C);
    --            E;             J[              E]             =T
    [E   ]=  E)   printf("._");  for(;(A-=Z=!Z)  ||  (printf("\n|"
    )    ,   A    =              39              ,C             --
    )    ;   Z    ||    printf   (M   ))M[Z]=Z[A-(E   =A[J-Z])&&!C
    &    A   ==             T[                                  A]
    |6<<27<rand()||!C&!Z?J[T[E]=T[A]]=E,J[T[A]=A-Z]=A,"_.":" |"];}

the Z[A-(E ... :" |"] expression spanning the last 3 lines saves 2 characters over the conventional alternative (A-(E ... :" |")[Z].

[1] https://www.ioccc.org/

   ./maze 
   136789
    _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._     ._._._._._._._._._
   Segmentation fault (core dumped)

C has many syntactic sugar and [] operator is one of them. -> is another popular one.

Of course not, everyone knows that a[b] is equivalent to *(a+b)

"the worst feature of C is that switches don't break automatically before each case label. This code forms some sort of argument in that debate, but I'm not sure whether it's for or against"

https://www.lysator.liu.se/c/duffs-device.html (the original, better description)

https://en.wikipedia.org/wiki/Duff%27s_device

https://xkcd.com/1053/