Using the concept of an idealized light bulb, one subject to a constant probability of failure while in use, certain distribution problems are solved heuristically. These include: (1) The distribution of sums, or differences, of products of pairs of independent standard normal deviates; (2) The distribution of the difference of 2 chi squares, each with even degrees of freedom or, equivalently, the difference between 2 total waiting times; (3) The distribution of the ratio of 2 chi squares, each with even degrees of freedom or, equivalently, the ratio of 2 total waiting times; (4) Distributions arising in a simple exponential growth process.