Breakup of Air Bubbles in Water: Memory and Breakdown of Cylindrical   Symmetry
  Using high-speed video, we have studied air bubbles detaching from an underwater nozzle. As a bubble distorts, it forms a thin neck which develops a singular shape as it pinches off. As in other singularities, the minimum neck radius scales with the time until breakup. However, because the air-water interfacial tension does not drive breakup, even small initial cylindrical asymmetries are preserved throughout the collapse. This novel, non-universal singularity retains a memory of the nozzle shape, size and tilt angle. In the last stages, the air appears to tear instead of pinch. 
Nathan C. Keim, Peder Moller, Wendy W. Zhang, and Sidney R. Nagel