My spouse works in a nuclear research facility. Everytime they talk about radiation or something i make jokes from the HBO "Chernobyl" series like "3.6 Röntgen, not good, not terrible".
Some years ago i gifted them a snow globe for birthday, but not one with a snowman and white particles, but one with a little chernobyl plant and black particles. Their coworkers found it funny. It is still at their desk these days.