Why this #PizzaRat is driving social media crazy

US-based comedian Matt Little posted a video on YouTube on Monday, in which a rat is seen dragging a whole slice of pizza down a New York subway's stairs.

After watching the video, people fell in love with the rodent instantly and did what they're good at - made the pizza rat trend and the rodent became an instant celebrity.

Using their creativity, the twitterati made GIFs and vines and made the poor little fellow a legend. Read more here.

Twitter reactions: