[KS] A datum is a data point and so is a count noun with a plural of data. However data meaning information is a mass noun and takes a singular agreement.
The whole 'Just Bail' Idea related to something one of the guys I know from my accommodation, who once said 'let's just bail' at a party, and so it stuck, and got written on a large board and put in the window. It was then at a recent poster sale that we saw a 'keep calm' poster, and decided to change it. It was initially going to be 'Just Bail', but this would not fit with the whole idea of an odd number of lines, so the expletive got added. We are now planning on getting the poster printed up at A2 or A1 size, and put on the kitchen wall.