i want to share some experience also. just happened last month.
I remembered i just saw "ghostly" figured waaay back when im kid, until now 40+ never saw anything.
but when u cant see it, doesnt mean it dont exists.

so story like this, i went back my hometown, theres this famous restaurant/cafe that on top of the hotel. This hotel after mco already closed down, only the restaurant still in business. That area also many ppl say "keras" laaa...

so one night, went there for dinner with wife, all ok, was "joking" with one of the waitress about nobody staying at hotel, then i said " the boss should let the staffs stays for free", then the waitresss said "give free also dont want laaa" and we both laughs... (classic example of saying stupid things)

so 5 minutes later, i felt my whole body suddenly changed. whole body fuking ache, my neck like being strangled, something i never felt like that before.... as if i feels like my body is dying.... just like the experience of someone going to die like that .... i tot it was just fever then the whole night feeling want to die
like that.

after telling my experience, then some ppl said i got "touch" or kena by those "dirty" things lor...

so my point is when going those places, best to maintain politeness and keep quiet