The first iPhone demo involved bringing in a portable cell tower, hardcoding signal strength to always show 5 bars, and repeatedly swapping out phones throughout the demo because using one through the whole presentation would have caused it to crash[0].

I believe Theranos was worse in many ways, but running misleading demos to drum up hype sounds pretty par for the SV course.

[0]: https://www.nytimes.com/2013/10/06/magazine/and-then-steve-s..., https://www.techspot.com/news/54246-former-apple-engineer-re...