Gambling trick #394583495634965:
Put a dot of super glue on the bottom part of the butt sleeve, so that when you roll it the cue flops around like a fish out of water. Roll the cue back and forth on the table while making the game with your mark, the key is to hold eye contact with him/her. Their eyes will bug out of their head while watching your cue bounce around on the table and will think that you won't be able to make a ball with your "crooked" cue.
Put a dot of super glue on the bottom part of the butt sleeve, so that when you roll it the cue flops around like a fish out of water. Roll the cue back and forth on the table while making the game with your mark, the key is to hold eye contact with him/her. Their eyes will bug out of their head while watching your cue bounce around on the table and will think that you won't be able to make a ball with your "crooked" cue.