There are impersonators and impostors all around us.
In addition to the people you call your "friends", you have to look out for bacteria and viruses who often gain access to our bodies by making our cells think they are something else. Then once we let them inside, they turn on us and wreak havoc.
We don't have the space here to get into the details of how this works on a molecular level so I am going to try to explain how this works using an example we can all relate to.
It's kind of like going to Youtube and searching for You only live Once by the Stokes and then getting this:
You may end up with a headache, then maybe progress to some nausea, vomiting, stomach cramps, diarrhea. And if you're really sensitive you may end up with meningitis and start having fevers.
Or maybe you're into that kind of thing and you strip down to your bikini briefs, pull out your pan flute to play along, and nance around your apartment for 7 minutes.
Those of you who feel ill, here's the treatment:
Trust me... I'm a doctor.