我之前都成日聽倒生日歌即使我冇店到果舊野(as my home have a thing if u touch it,it will play a birthday song.i always touch it with careless) ...開頭我都驚自己系咪幻聽...但睇左psychologist and he said that it just 心理作用...吾洗擔心...i think your situation is same with me and so...you no need to worry...只系平時聽慣左先會成日聽到球聲同咳聲和講野炸...吾洗擔心=]