Meth
Many people use coffee or, if they only need a caffeine boost, Pepsi, as a pick-me-up. But when you switch from caffeine to a strong dose of methamphetamine, things take a whole other turn. In 2015, Fred Maldonado asserted that after consuming the majority of his In-N-Out milkshake, he used a paper towel to uncover several capsules at the bottom of the container. He claims that after purchasing it, he drank half of it before going home and finishing the rest the following morning. When he returned to In-N-Out to inquire about the situation, they gave him a free burger.
Maldonado ordered a lab test on the tablets since he wasn't happy with the meaty reward, and the results showed that meth was there. That's not on the menu, to be clear. Maldonado sued In-N-Out, alleging that he became unwell after ingesting the shake, but In-N-Out didn't offer any remorse and instead vowed to defend itself in court.
Maldonado, for his part, got the pills tested at an impartial lab, which determined they were meth but also found no indication of the substance in the cup or on the napkin he purportedly discovered in it with the tablets. That certainly seems shady, to be honest. Yes, it does. Regrettably, the tale appears to end here, as there is no further information available online on the case. Usually, but not always, that signifies the dispute was resolved outside of court.