LM555, or even UA555
BC546, 547, 548, 549, 556, 557, 558, 559, OC44, OC45
LM78xx, LM79xx, LM317, 2N3055, MJE2955
4000 series what?
74C series what?
selenium rectifiers, (still find them on old lead acid battery chargers.)
Just about anything that uses a vacuum as its operating medium, ie globes, valves(tooobs).
PS: What I'd hate to see, a switch and a light source and a 64bit controller between them, its only job, that turning the switch ON, turns the light ON.
(Oops forgot the complicated bit, turning switch OFF turns the light OFF, might have to goto forum to find out how to do that.)