A sharp tongue does not mean you have a keen mind

Are you always this stupid or are you making a special effort today

Brains aren't everything. In fact in your case they're nothing

Don't let you mind wander - it's far too small to be let out on its own

He always finds himself lost in thought - it's an unfamiliar territory

He doesn't know the meaning of the word “fear” - but then again he doesn't know the meaning of most words

I don't know what makes you so dumb but it really works

I don't think you are a fool, but what's my opinion compared to that of thousands of others

He does the work of three men: Larry, Curly & Moe