I heard that String Theory actually began as 5 different theories. Later, they were unified into one theory called M theory.
Of course I found some iterations of M theory as well.
1. M&M Theory: This theory hits the sweet spot in quantum mechanics.
2. S&M Theory: You must wear protective garments to do the math.
3. Anti-M Theory: This is utilized by physicists who want to go home to Kansas through a worm hole.