Sid learning comparative, superlative

Sid has the comparative and superlative forms of words (in class 3 for god's sake). So I ask him for the c and s forms of good. He said 'better' alright. And was struggling with the superlative...'betterest' was one answer. I told him to remove some alphabets from the word and would get it right. The next answer was 'brest'.. hilarious when spoken :):):)