Worst, definitely cat being sick, nothing wakes you up faster!!
Most alarming was Red deer barking / grunting outside my tent. I was wildcamping on my own on a deserted loch side and it was dark, around 2am. I had no idea deer made that noise and woke wondering if Scotland had wild boar! After some deliberation I put my big girl pants on and grabbed my torch before I unzipped the tent, I was so relieved to deer staring back at me!