What I've learned from watching Trollhunter
1) If your body can't break down vitamine D, you will explode. Or turn to stone (depends on how old you are) and this appears to be a very traumatic experience which will last for the rest of your short life.
2) Even though faith is just a state of mind, trolls can sense it through telepathy even though their IQ is lower than that of a potato.
3) As you're hiding from a nearby troll, yell "HEY!" to your friends only to tell them "Ssssht".
4) When your Christian cameraman get's eaten by a troll, simply replace him with a Muslim. That should do the trick.
5) Trolls look suspiciously much like CGI.
6) To take a troll's blood-sample, throw blood from a religious man in front of him (because religion is encoded within DNA), then walk behind him and yell "HEY!" before you stab him with the syringe.
7) People place fake bear footprints with their own bodyweight, yet footprints from 100 meters tall trolls can somehow go unnoticed to the public.
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