Using ASAS-SN data , we find that the bright ( V { \sim } 13.5 mag ) variable star MACHO 80.7443.1718 ( ASASSN-V J052624.38-684705.6 ) is the most extreme heartbeat star yet discovered . This massive binary , consisting of at least one early B-type star , has an orbital period of P _ { orb } = 32.83 \pm 0.05 d and is located towards the LH58 OB complex in the LMC . Both the ASAS-SN and TESS light curves show extreme brightness variations of { \sim } 40 \% at periastron and variations of { \sim } 10 \% due to tidally excited oscillations outside periastron . We fit an analytical model of the variability caused by the tidal distortions at pericenter to find orbital parameters of \omega = 53.5 \degree , i = 45.7 \degree and e = 0.58 . We also present a frequency analysis to identify the pulsation frequencies corresponding to the tidally excited oscillations .