From "Star Trek: The Next Generation: Data's Day (#4.11)"
[Ambassador T'Pel has tried to get restricted information from Data about the Enterprise, pretending that she was only testing his security safeguards
Lt. Commander Data
] I have often wished for the sense that humans call intuition, or instinct. Since Vulcans are incapable of lying, I must accept the Ambassador's explanation as the truth. But I would still prefer a... 'gut feeling' to back up this conclusion.