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) Similarly, "We should take the scientific research budget and use it to feed starving children." the claim that whatever has not yet been proved false must be true (or vice versa).Essentially the arguer claims that he should win by default if his opponent can't make a strong enough case. First, the arguer claims priority, but can he back up that claim ?Second, he is impatient with ambiguity, and wants a final answer right away.
For example, "Von Daniken's books about ancient astronauts are worthless because he is a convicted forger and embezzler." (Which is true, but that's not why they're worthless.) Another example is this syllogism, which alludes to Alan Turing's homosexuality: (Note the equivocation in the use of the word "lies".) A common form is an attack on sincerity.
It is related to Not Invented Here and Changing The Subject.
Ad Hominem is not fallacious if the attack goes to the credibility of the argument.
All of these work better if you are running things - for example, if it is your radio show, and you can cut off the other person's microphone.
If the host or moderator is firmly on your side, that is almost as good as running the show yourself.