To avoid a vote on a proposal to limit collective bargaining rights in the state of Wisconsin, 14 legislators have fled the state, to an undisclosed location. I am not sure if there is a precedent for this. The reason they crossed state lines was to dodge the Wisconsin police.
It turns out that "Republicans hold a 19-14 majority, but they need at least one Democrat to be present before voting." The link is here and for the pointer I thank Brian Hooks.