This
funny black t shirtsays exactly what I am thinking when someone interrupts me when I am busy. You can be wearing this t-shirt and if someone comes up to you, no matter what you are doing, you can just point to the "LOADING PLEASE WAIT" and that says it all. As far as funny t shirts go this is rather subtle with many meanings from "leave me alone" to "I am not ready for work" to "I need coffee".