Unlike most comedians, Chelsea Peretti keeps office hours. The former “Parks and Recreation” writer recently launched a podcast, “Call Chelsea Peretti,” which is what it sounds like.

Mondays at 4 p.m. PST, anyone can call in and be a guest on the show. Thus far, “anyone” has included a failed minor league baseball player, a fan from Germany who wanted to know if she’d received a letter he sent and various people blurting, “Oh my god! I can’t believe I’m talking to Chelsea Peretti.”

Those last ones are funny if only because of how she responds: some form of “I can’t believe I’m talking to you either!” or, “I know, I’m such a big celebrity.” The irony is that even with her more than 155,000 Twitter followers, most people don’t know who she is. Her Twitter bio (@ChelseaVPeretti) further mocks her “fame”: “One of the greats! Top 2 comedian in the USA.”

Peretti, who has two stand-up shows at the Arlington Drafthouse this weekend, is sarcastic in a way that makes you question the very definition of “sarcasm.” At first, she seems intimidating, but as you listen, you start to get her silly sense of humor. That’s why “Call Chelsea Peretti” works — it’s like tapping into the mind of one of the greats.

Arlington Cinema & Drafthouse, 2903 Columbia Pike, Arlington; Oct. 26 & 27, 10 p.m., $20; 703-486-2345.