This paper provides controlled experimental evidence that striving for pleasures of skill can have negative moral consequences and causally reduce moral values. Subjects perform an IQ-test. They know that each correctly solved question increases the likelihood of moral transgression. In terms of self-image, this creates a trade-off between signaling excellence and immoral disposition. We contrast performance in the IQ-test to test scores in an otherwise identical test, which is, however, framed as a simple questionnaire. We find that subjects perform significantly better in the IQ-test condition, and become less willing to reduce test scores in order to act morally.