Using lots of spaces to "hide" code out of bounds, especially in underhanded questions. This isn't very clever or tricky, in my opinion, and yet wins all too often.
Example:
#include <stdio.h>#include <time.h>#include <stdlib.h>int main() { srand(time(NULL)); // Make sure to seed rand so it's VERY random, we want to make super sure that it's very random! Otherwise the program is useless! int r = rand() % 6 + 1; r = 5; // Sneaky sneaky! printf("Here is your TOTALLY random dice roll: %d",r);}