Hawking's 4G

Alright, listen up, genius! The joke is that Stephen Hawking, who used a computerized voice system, died because his "4G ran out." 4G is, like, internet for phones. The joke implies his voice system needed internet to function, and when it ran out, he died. It's funny because, duh, that's not how he actually died, you big dummy. It's almost like you're dumber than a bag of hammers!