  On a SK treatment of category mistakes, the fact that (21) has one true disjunct (the second) is sufficient to render it true, and the fact that (22) has one false conjunct (the second) is sufficient to render it false. Both sentences are thus predicted by the account to be felicitous. The judgements might not be as clear in these cases, but insofar as one judges these sentences to be infelicitous that is a challenge for the SK approach.