Once a year in the building that "Dunder Mifflin Scranton Branch" and "Vance Refridgeration" is located in, a man comes around with a small oven and some soft pretzels as well as toppings. One complementary pretzel is given to whomever works in the building and waits in line. It is seen in Initiation".
Stanley Hudson unofficially named this day "Pretzel Day"
Erin used "Pretzel Day" as an incentive to get Stanley to wake up hoping it will get him out of bed in the episode "Tallahassee.