IQ wasn't something that could go negative. After all, humanity's methods of testing IQ were still limited to answering questions. Even if someone failed to answer a single question correctly, they could only get a zero.
Deadpool's negative IQ was really just a joke. Mainly because the doctor he had found back then had been unreliable.
He had once gone to see a doctor because he kept hearing inexplicable voices in his head. That doctor had no medical ethics whatsoever and only wanted to dissect Deadpool for research, so he put on a show of giving him an IQ test.
In the end, he concluded that Deadpool had an IQ of negative twenty, then exaggerated a whole bunch of things, mainly hoping Deadpool would agree to let him operate on his brain.
Why were there voices speaking in his head? Naturally, the only way to find out was to open up his skull and take a look.
So he tricked Wade onto the operating table and removed his brain for study.
But what he did not know was that an ordinary person would definitely kick the bucket if their brain were removed, while Deadpool could not die.
So when the doctor found nothing, started cursing, and revealed his dark plan, Wade sprang up from the operating table and stabbed him in the back, killing him on the spot.
Deadpool did not find being fooled embarrassing at all. Instead, he treated it as a joke. Whenever he compared IQs with others, he always brought up that negative twenty.
If you had something nobody else had, even if it was "negative IQ," that was still pretty damn impressive.
But even as a joke, it left Bobo speechless. The ape had never seen someone so shameless that he could actually admit his IQ