The infinite positivity drive was definitely the least-well thought out psychedrive technology to make it to production.

The crews of the initial three Smileships were chosen for positive mental attitude and an extreme tolerance for their fellow enthusiastic extroverts. After all, the corps reckoned, when your FTL capability is wholly reliant on the happiness of your crew, it’s essential that positivity is mandated and tightly controlled.

It came as little surprise to the rest of the known galaxy when two of the three vessels tore themselves apart in a series of mental breaks during extended missions, and the third was last heard from in deep-space, its crew trapped in a self-perpetuating cascade of minor concerns.

Amidst post-mortem and corporate hand-wringing, the working group all agreed that the fundamental technology was sound; it was their employees who’d been lacking.