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I Only Use Sarcasm Periodically T-Shirt dropship_exclude-SCAR069-XLT If you are ready toThis 80sTees. com exclusive t shirt shows the world "Sarcasm" spelled out in a periodic table. The shirt reads I Only Use Sarcasm Periodically. Sarcasm is a form of speech where someone says the opposite of what they mean, often in a mocking or humorous way. With a simple Eye roll, smirk, or a change in a tone of voice, you're well on your way to making conversations a lot more entertaining.