This is going to sound weird. It's been happening as long as I can think back.
At any time, in any situation, I'll get a brief flash of a taste in my mouth...but I'm not even sure it's a taste. Seems like one.
It's unlike anything, and I can't compare it to anything. It doesn't taste chemical, or like food...it's...."otherwordly" (if I may be so bold). It happens maybe 4 times a year on average, and lasts a half of a second.
Is this normal? For something to occur in the brain that flashes a weird fake-sense in the mouth? I can't define it, so it almost feels like....(I'm no neurosurgeon here, forgive me for this stupidity) some nerve fires off at the wrong time and accidentally produces the sense. It's always the same taste, which is what's not-random about it... but when I try to REMEMBER what it "tastes" like, I can't. It's frustrating - I only remember what it's like when it happens, and then it's gone.
Weird stuff.