(Please, anyone who wants to, keep leaving more in the comments--with a little explanation of what they mean to you.)
Poet Hugo Ball (below) started Dada in World War I in response to what he saw as the "glaring mistake" of confusing people for machines.


Image found on Dali House--also there, a nice write up about Hugo Ball.
Here's a rendition I like a lot because of the dancing typefaces: