are usually very intellectually stimulating and enlightening. Viewers leave with a new sense of purpose, or a new outlook. But this very different talk titled “A TED speaker’s worst nightmare,” which could really be applied to any speaker, takes an unexpected turn. 

Just as Colin Robertson starts his presentation on solar-powered crowdsourced health care, his computer freezes. Then a dream-like spectacle similar to what a nervous public speaker might imagine unfolds. The magic was a collaboration between TED and Improv Everywhere