I don't think it's that crazy. If a PPL candidate flew a practice flight the day before or the morning of a test (sensible thing!) then he probably would be more current than the examiner but bear in mind that the examiner must be 'officially current' (well spotted on the 90 day rule) and examiners have a lot more experience than the candidates.
(BTW on test, in single pilot a/c, the examiner is actually in command - candidate is P1s if they pass and Pu/t if not).
Speaking for myself, if there's any doubt about currency or familiarity with the a/c, I'll go up in it beforehand.