professor: Given the speed of light as 3 x 10^8 m/s and the density of water as 1km/m^3, what's my age?
Student: I'd say about -- 46.
Professor: Excellent! How did you know that?
Student: You see, sir, my brother's 23 and he's only half-mad.
You connected the live permanently to one of the lamp contacts, and neutral permanently to the other. Am I right, or am I right ?
Try changing the light switch. It may be permanently short circuited.