  We have carried out a survey for `giant pulses' in 5 millisecond pulsars. We
detect individual pulses from the high Edot pulsar PSR B1821-24 with energies
exceeding 50x the mean pulse energy. These giant pulses are concentrated in a
narrow phase window coincident with the power-law non-thermal pulse seen in
hard X-rays. This is the third example of the giant pulse phenomenon. It
supports the idea that large B fields in the outer magnetosphere are critical
to the formation of such pulses and further suggests a direct connection
between giant pulses and high energy emission.
