1/3

Synopsis
Mathman plays a video game in which he must eat only fractions equivalent to 1/3, such as 2/6, 3/9, etc.

Mathman starts by eating 2/6, followed by 3/9. When he encounters 5/10 (which is actually equal to 1/2), he declines. He accidentally eats 4/5, and is eaten by Mr. Glitch.

Correct

 * 2/6
 * 3/9
 * 4/12
 * 5/15

Incorrect

 * 1/4
 * 2/5
 * 5/10 (= to 1/2)
 * 8/12 (= to 2/3)
 * 4/5

Quotes
Announcer: "And beware the obstreperous Mr. Glitch. He will eat you if you are wrong."