What’s goes down, shouldn’t come back up

I was on train going from Amsterdam to Berlin. I was in the bathroom washing my hands when I heard a gurgling coming from behind me. I turned to see what it was. With what I can only describe as a kind of coughing sound, the toiled spurted back on to me what I can only imagine is what I left in it. I’m not sure what to hope for in this case, really. Regardless, it was nothing that I wanted on me. I was horrified. I took off the jacket I was wearing, thankful that I at least had that much protection and just left it in there. I returned to my seat feeling like I could never be clean again. -Carrie M.