I don't work on Sunday

Guess what? I just checked my email and realized that someone actually got a face thick enough to ask me to go back to my lab to teach him how to use a software on a SUNDAY. Don't he know that Sunday is for family/Xian/friends, or recreation, or for zobo-ing (rest). I don't even feel like doing the things that I ought to do, not to say travel so far for "extra work".

I'm the remaining person (target) left for arrows to land on...

I'm fanatically seeking Xian's help to "clone" an impt h/w so that I can use it as and when I like...