Why a billiards-room drink can spill
Placement matters even between shots.
Avoid cue and sleeve contact
Keep the drink beyond the arc of a cue being picked up or put away.
Keep the footprint clear
Do not let scorecards or coasters create an uneven stack under the holder.
Move the drink when the room changes
Extra chairs or spectators can change the walking route. Reposition the drink table if the original spot becomes crowded.