Jon Najarian has suggested Boil ($BOIL), a natural gas contract that offers double leverage. This contract has experienced a significant surge in its value, rising from less than $6 to $7.70 within just one week. According to the speaker, a large investment of 3.6 million shares equivalent to 36,000 weekly March 8 calls has been made in this contract. Despite its slightly higher market price, the speaker considers it a cost-effective opportunity to follow. Additionally, the speaker has revealed that they have invested in Boil as well as other natural gas investments such as $UNG for some weeks.