I had an experience like that where an education researcher was attempting to prove that a certain style of teaching was more effective. It involved a test measuring how much students remembered from a conventionally-taught course taken the year before; the researchers hoped to show that these scores were low, and therefore that conventional teaching methods were ineffective. I and another classmate aced the test so the researcher accused us of cheating, even though there was no incentive to cheat (the test wasn't used for any grade, so if anything, the incentive was to save time by leaving answers blank). We denied cheating, explained that the course instruction had been very memorable, and proved it by correctly answering followup questions on the spot. Ultimately our high-scoring test results were discarded as outliers and the hypothesis was successfully validated.