Is it true that touching light globes with bare fingers can make them ‘blow’?

Yes, this is correct. The manufacturers advise not to touch the globes with bare hands and that they should only be handled by holding the metal base. Regardless of how clean our hands are, the oils on our fingers can cause hot spots on the glass, which may cause the globe to break or shorten its lifespan. This is especially true for halogen globes and lamps, which are commonly used in headlights.