I am served at a table, In gatherings of two or four Served small, white and round. You'll love some, And that's part of the fun. What am I?

Why this works

This riddle cleverly plays on the imagery and context surrounding ping pong balls. The phrase "served at a table" refers to the table tennis game where the ball is served, while "in gatherings of two or four" hints at the typical number of players involved in a match (singles or doubles). The description of being "small, white and round" perfectly fits the physical characteristics of ping pong balls, and the line "you'll love some, and that's part of the fun" plays on the enjoyment of the game and the excitement of competitive play. Thus, the riddle encapsulates the essence of ping pong in a playful and clever way!