In a 1924 Science and Invention article, Hugo Gernsback surveyed the scientific ways to test whether a marriage would succeed. One was the smell test (seen above). Matt Novak finds the nervous disorder test more disturbing:
The nervous disorder test is perhaps the most amusing in that it imagines a man (let’s call him Professor Sixshooter) delivering a surprise gunshot in the air. The “nervous reaction” of both people is recorded on tape and if they both are too startled “marriage should not take place.” I don’t know about you, but I’d be a little uneasy if my partner wasn’t startled at the sound of a gunshot.
I'm a big believer in the smell test myself. Hence my longtime rule for dating someone: no deoderant, no clipping any hair anywhere.