A solid scientific base for what basically everyone knows already :-) Also, unlike previous analyses appearing on the internet, this one is in English, so everyone can understand it and spread the word.
(2) H. C. Mayer, R. Krechetnikov, "Walking with coffee: Why does it spill?", Phys. Rev. E 85, 046117 (2012). There is also a popular synopsis about it.
I was used to think that spilling coffee while walking (and then making innocent eyes and speeding up) was my own problem, because I basically break everything I touch. This article made me feel normal, just as everyone else. Finally, there is a scientific base for spilling coffee!