If you suspect trouble or are attacked, push the alarm button and as many floor buttons as possible so that the elevator will halt quickly, probably at the next floor.
Respond to instinct, intuition or gut reactions. Don't get on an elevator with someone who makes you feel uneasy.
If other passengers get off, leaving you with a person(s) who make you feel uneasy, get off with other passengers and wait for the next elevator.
Allow other passengers to push the buttons for their floors first.