There are levels and degrees of stupid . A couple of these guys have a Masters degree in stupidity .

With one more neuron they might could manage a synapse.
They couldn't pour [censored] out of a boot if the directions were
written on the heel.
Too much yardage between their goal posts
Their wheel's spinning, but the hamster's are dead
They're proof that evolution CAN go in reverse
They got into the gene pool while the lifeguard wasn't watching