No pops today, but Denbury was active all day, as were a bunch of other oil & gas stocks ... OAS, RIG, SDRL, WFT, ESV, WLL, NE, NBR, PTEN, etc. The energy sector stocks have all crashed following crude, so they're active every day and have been for many months now. You can see the cycles in the market by what's active: tech, financials, energy, healthcare (specifically biotech). You have to pay attention.