This lesson shows the flaws in using PEMDAS for order of operations. Start the lesson by having students solve viral math problems pulled from Facebook. Students will inevitably get different answers as they misapply/misremember order of operations. Discuss where PEMDAS breaks down (ie seeming that multiplication and division happen on different steps, parentheses is the only form of grouping, etc). Introduce GEMA (Grouping, Exponents, Multiplication & Division, Addition & Subtraction).