I worked at a deli and a woman came in. My CO workers were helping others so I nodded to her so she knew I saw her before I got new gloves on. When I turned around to get my gloves she fully goes into raging manic mode screaming, telling everyone how I'm a little expletive and I'm ignoring her and I'm awful etc. swearing the whole time. I was wearing a mask after COVID and couldn't get a word in. Random other customers who were there were coming to my defense, so she yelled and swore at them too. After about 30 seconds I just walked away and got the manager. I am glad I was wearing a mask because the whole thing was so surreal and amusing that someone would completely loose self control so quickly without a word stolen to them. My facial expression was probably not the regret she wanted to see, more shock and then adjustment, because this is the stort of thing people go gotcha, hidden camera for. Looking back, I'm very glad there was a larger counter display case between us, because her mood could have because physical very quickly. That customer was put on a watch list for the store, if she did anything out of line again she wasn't allowed back.