Percepshrooms

Percepshrooms are a legendary type of mushroom found in Gravity Falls, Oregon. When ground up into a sort of jelly and applied to the forehead overnight, they increase brain power. When consumed, it still produces the same effect.

History
At some point before the events of the series, the author of Journal 3 came across and studied the object, recording its powers, appearance and location in said book.

In the "Little Gift Shop of Horrors" story, Abaconings, Dipper reads about them in the journal, and locates them. Leaving it overnight on his head as the journal instructed, Waddles eats it, gaining massive amounts of brain power instead.

Appearance
A Percepshroom is a mushroom, with its cap having the appearance of a brain.

When ground into jelly, it appears to be sparkling pink goop.

Sightings
Гриб мудрости