The probability of correctly guessing three different, consecutive letters if you cannot read (provided you know all 26 letters, which if you're reading this, is a hell of an assumption) is 1 in 17,576. Isaac just did that with L, O, and T in the "Lotto" sign at the store where we went for milk.
Yeah, he's 21 months old. And either he's pre-reading, or he's the luckiest little shit in the USA. LOTTO indeed, son. LOTTO, indeed.