Put down your margaritas for a second and get serious, because we have some not-so-great news to share with you: The world is currently on the brink of a massive tequila shortage, which means that your Friday and Saturday nights might be in jeopardy soon.According to Reuters, a shortage of agave — the plant used to make the drink — is causing quite a stir for tequila producers in Mexico, not to mention that the price of the plant has increased dramatically (3.85 pesos per kilo to 22) over the past few years. Agave plants normally take seven to eight years to mature, and the report states that only 17.7 million blue agaves were planted in Mexico in 2011. That has potential to become a very large problem, since 42 million plants are needed to supply 140 registered Tequila companies. Unfortunately, the shortage is estimated to last until 2021, which means a lot of people are either going to have to cut back on their tequila intake or switch over to an alternative for a while.