I failed the test, so obviously I’m a genius.
Sarcasm. The speaker says the opposite of what they mean. They failed, which suggests the opposite of being a genius—classic sarcasm using irony.
Bananas are technically berries, but strawberries aren't.
Real. Botanically, bananas meet the criteria for berries (from a single ovary, with soft outer layers), but strawberries do not.
Yeah, because the best way to fix a computer is definitely to scream at it.
Sarcasm. This mocks irrational behavior. Screaming doesn’t fix anything, so the exaggeration is clearly sarcastic.