DR JRand it's not a real hamburger. 

It's a toy that starts off very small and then grows in water.  
The best part was listening to the 4 year old describe it.
Almost as funny as Saturday afternoon when his dad bought him a chocolate ice cream cone. I was watching this kid like a hawk.  But I must have looked away for a second.  And when I looked back his entire t-shirt was covered in chocolate.
I asked him what had happened (assuming some spilled in his shirt).  But it turned out (in his words) "well i had this moustache on my face, and it was bothering me, so i just wiped it".
Hmmm, basically he intentionally used his shirt as a napkin even though he had a napkin in his hand. 
