Explosive Ising
  We study a two-dimensional kinetic Ising model with Swendsen-Wang dynamics, replacing the usual percolation on top of Ising clusters by explosive percolation. The model exhibits a reversible first-order phase transition with hysteresis. Surprisingly, at the transition flanks the global bond density seems to be equal to the percolation thresholds. 
Sebastian Angst, Silvio R. Dahmen, Haye Hinrichsen, Alfred Hucht, and   Martin P. Magiera
cond-mat.stat-mech