I don't tuck my jersey in until the pitcher of either team takes the mound in the top of the first.
I do a secret handshake with my teammate before I go up to bat each time.
When I get into the batter's box, I step out with one foot, adjust my helmet, go back in, practice swing, step out, adjust my helmet again and check my batting gloves, then step back in and tap the plate at the bottom corner with my right arm two times.