Decent PRNG algorithm

// Zero collisions for all input 0 .. 65535
// Does not seem to get stuck in a tight predictable sequence.
// I can't predict nor see a pattern in its output.
// Test cases: http://pastebin.com/Kz7dLGBC

#include <stdint.h>

uint16_t
get_random_number(uint16_t seed)
{
    uint16_t out = (seed + 1) * (0xacdc + 1);
    return out == seed ? ++out : out;
}

// Unlike Munroe's RNG (xkcd.com/221), it's not *guaranteed* to be random, as it wasn't chosen by a fair dice roll