People I Try To Avoid #2

THE CLEARLY INSANE:

Now this one's probably obvious. Of course i want to avoid crazy people.

However, you must understand the true dread of meeting the truly deranged. If you are unlucky, you will not realise it has happened to you until it's too late. Nothing replaces that small, slight panic as your normal-looking customer opens his or her mouth and spouts forth a frothing pile of drooly nonsense.
From here, your experience can lead down two equally unpleasant paths:
1)- Whatever it is they want, you certainly dont have it. You of course try to pass this information onto them, but it will have even less effect than it does on a normal, sane* customer. The predictable explain-repeat-repeat-try to run away cycle ensues, but instead of a normal* person, you instead have to deal with someone who may well be wearing underpants on their head. Why is this worse? Because the truly insane seem to enjoy the mindless repetition. They simply won't leave you alone. The only way out of this cycle is to show them something that will amuse them for a few minutes, then go hide somewhere.

2)- They actually want something you can help with. This is possibly worse. Similar to the events described in 1), only now you have to explain things to them. They will invariably want something complicated. Like the old people i mentioned before, they will not understand your explanations, no matter how simplified you make them. What makes this worse is that running and hiding isn't usually an option. Instead you have to stay with them until they actually get what they want. Or you commit suicide. Whatever happens first.

For extra flavour, Insane person may also have one or more of these extra features:
-Drool. Nothing is quite so off-putting as having someone leaving puddles on your counter.
-Intense smell. Your regular crazy person has little time for hygeine, or the concept at least eludes them. Their very presence makes you want to vomit.
-Sudden, unexpected smell. There is something truly horrible about someone smelling of human excrement. There is something worse about this smell only arriving several minutes into the conversation.
-Random, surprising behaviour. I have experienced such gems as 'getting up really really close to you without any warning whatsoever', 'repeated touching', 'showing me your rather unpleasant disfigurement' and 'crying for no apparent reason'. All of these i feel underqualified to deal with.

*- Sort of.