Who you gonna call when you’re a young patient in a Boston children’s hospital?

Melissa McCarthy and her fellow Ghostbusters Kristen Wiig, Kate McKinnon and Leslie Jones provided the answer to that question when they paid a surprise visit yesterday to Tufts Medical Center in Boston, where they’re filming the reboot of the iconic supernatural comedy.

The women, decked out in their ghost-busting uniforms and equipped with their proton packs and other gear, visited with children and their families the famed Floating Hospital for Children, posing for photos and even letting the kids handle props from the upcoming comedy.

“Thank you for taking the time out of filming today to put a big smile on our patients faces!” read a post on the hospital’s Facebook page, which also included several photos from the stars’ visit: