side = choose(0, 1, 2, 3);
if (side == 0)
{
    x = random(room_width + 160) - 80;
    y = room_height + 80;
}
if (side == 1)
{
    x = random(room_width + 160) - 80;
    y = -80;
}
if (side == 2)
{
    y = random(room_height + 160) - 80;
    x = -80;
}
if (side == 3)
{
    y = random(room_height + 160) - 80;
    x = room_width + 80;
}
size = 2;
friction = -0.3;
move_towards_point(room_width / 2, room_height / 2, 2);