All fun and games until some of their blood makes it on the bagging area.
"Unknown item in bagging area, please remove! Unknown item in bagging area, please remove! please place item in bagging area! please place item in bagging area! Detected item removed from bagging area, please replace the item! Please wait for someone to assist you." A robocashier shows up. "Sir, unknown item in bagging area, please remove it!". Eventually all the robocashiers are summoned to that one area and the entire system crashes because they overload the wifi hot spot and just start singing daisies.