Now, admittedly, a little chub can make the sides of a chin appear a bit rounder than they usually would, but as you have already seen from the facial comparisons, these men's chins simply do not match in length, width and general outline.  
     

     First of all, you'll notice that in some of these photos the chin juts to the right instead of the left; they have probably been flipped horizontally, and I simply didn't want to be accused of altering them by flipping them back in the correct direction; so, you'll still notice the crooked chin with a crooked cleft which has a distinctive V-shape and is very different from Paul's strong, round, set chin. But more than that, you can plainly tell that this is most certainly NOT at all how Faul appears today, nor how he looked during most of the 70's.  
 

     For starters, what the hell happened? He looks completely different. These pictures are only six years apart. Notice how different the corners of the eyes and the shape of the eyebrows look; more like Paul McCartney's (see next section). But more importantly, notice the chin. Suddenly, after the beard comes off, it's all round and straight, kinda like real Paul's in the pictures above; and if you look below at the young/old comparison, you will see the entire left side of his chin appear out of nowhere.  
     He is also not very chubby in any of the above pictures, so even if this was your explanation for Paul's round chin, then what is your explanation for Faul's suddenly round chin? This brings us back to the young and old comparison from section 2: 

     If you look closely at the right side of the face (his left) you'll notice that an entire side of his jawbone magically materializes out of knowhere, and in the middle it widens and becomes flatter, rounder, and less pointy, and looses the crooked cleft on the side; adding a straight cleft down the middle which you can't quite make out in this picture. Why in the world would Paul McCartney need plastic surgery to look MORE LIKE PAUL MACCARTNEY?! 
 

              
 
     Just look at how far that lip hangs down! No wonder they had to fix it, he looks like an ape. Compare it to the pictures above; again, these are only about six years apart. Does this first picture look like Paul McCartney, even as you know "Paul McCartney" today? Also, again note how much taller than John Lennon this man is; the perspective is a little off, but they're still standing pretty much side by side. 
 

     Again, a surgical procedure like this is bound to leave a scar of some sort. We also have to consider that he would have been wearing alot of makeup to better conceal these scars, so some pictures will give us a better look than other's. But, before we start looking for scars, let us first briefly take a closer look at the corners of those eyes; notice how the corner of the eye drops down in the young-old animation above...