What's one celebrity impression when you can do 29 in less than four minutes — while singing, no less? That's exactly what singer-songwriter Rob Cantor does in his latest video. While singing an original song called "Perfect," he imitates everyone from Britney Spears to Adam Sandler to Gwen Stefani. Honestly, you have to see it to believe it! Watch his incredible performance above, then check out more must-see viral videos!