hope this might be some top-10 FAQ item

when the garbage disposal is run in my kitchen, it flickers the lights on the other
side of the house, in a bathroom (just a single 60w bulb)

the disposal circuit (15amp) is not the same circuit as the bathroom (15amp) so what
might be happening here? the bulb does not burn out or wear out any faster (usually
lasts for couple years of continuous use)