Mind control ties

The "" were ties created by Ford Pines for the masters of Ronald Reagen.

History
Sometime before the series, Ford made the ties for the masters of Ronald reagen, and kept the ties afterwards.

Later, during the re-election for the mayor of Gravity Falls, Oregon, Ford handed the ties to Dipper after he tells him that Grunkle Stan isn't doing well in the elections. To convince Stan to use the tie, the twins lie to him that it's his "lucky tie".

On the final day of the election, Stan decides to not wear the other mind-controlling tie, and after Dipper gets angry and reveals the true nature of the ties, Stan bolts out of the room in anger.

The twins use the ties one last time with Soos in order to try and talk to Stan, only to be discovered behind the curtain, ruining their plan.