What kind of things do you play if you have to audition alone with your drums? What songs do you personally choose? Why? Do you instead play patterns? I just think it's interesting
a song from the band you're auditioning for. or a really epic song on drums like anything by Rush would work. Just go behind your kit and do whatever it takes to impress people.
Are you auditioning for college/school/whatever, or a band? Schools usually have predetermined requirements for auditioning that you have to play. For a band, play one of their songs, a song in the same genre, or a song that demonstrates your versatility. Whatever you deem appropriate.
Do people actually audition drummers this way? It seems much more logical to just jam with them, and see if they fit.