We report the discovery of the first variable extreme horizontal branch star in a globular cluster ( \omega Cen ) .
The oscillation uncovered has a period of 114 s and an amplitude of 32 mmags .
A comparison between horizontal branch models and observed optical colours indicates an effective temperature of 31,500 \pm 6,300 K for this star , placing it within the instability strip for rapidly oscillating B subdwarfs .
The time scale and amplitude of the pulsation detected are also in line with what is expected for this type of variable , thus strengthening the case for the discovery of a new subdwarf B pulsator .