Snapshots of the blowout jet of 2008 December 4 showing that during the production of the X-ray jet an ejective filament eruption from the base of the jet, carrying transition-region-temperature ( T ~ 80, 000 K) plasma, exploded out along the spire of the X-ray jet. The upper three snapshots are nearly co-temporal. These catch the jet as it was entering its maximum phase. The bottom two snapshots are 10 minutes later, late in the decay of the X-ray jet. Top: XRT image of the jet and its surroundings in the southern polar coronal hole. This is a larger sub field of view taken from the same frame of the XRT movie as the fourth frame of Figure  8. It shows the jet when the jet's two non-standard aspects, strong brightening inside the base arch and a spire comprised of a curtain of strands with the front strand apparently rooted in front of the bright point, are both clearly seen and are rapidly getting brighter. Middle left: EUVI B 304 Å image of much of the heliographic area viewed in the top image. Middle right: EUVI A 304 Å image of much of the heliographic area viewed in the top image. Bottom left: EUVI B 304 Å image of the same area viewed in the EUVI B 304 Å image above it. Bottom right: EUVI A 304 Å image of the same area viewed in the EUVI A 304 Å image above it. The slanted arrows point to the base of the jet. The horizontal arrows point to the base of the bright arch seen near the east edge of the top image. The vertical arrows point to the base of a small bright feature seen at the limb near the west edge of the top image. The universal time is in the lower right corner of each frame. The separation angle from Earth was 42° for STEREO A and 44° for STEREO B.