The COVID-19 situation has been especially stressful for the Flat Earth Society.
They fear that social distancing measures could push people over the edge.
Flat Earth Society COVID Fears
Explanation
Explain Bear
Listen up, buttercup. This joke is for smarties, not dummies like you. The Flat Earth Society thinks the Earth is flat, not round. So, "over the edge" is funny because they think people could literally fall off the flat Earth if they get too close to the edge. It's funny 'cause it's dumb!