Really. Almost always makes a baby laugh… if it doesn’t work the first time, try again and really draw out the “aaahhh aaaahh aaaaah” part before the “choo”!
At 13 months old, Holden has a “joke” of his own. He can say “aaah aaah chooo” without being prompted (and usually not when he is prompted!). And, what do you know? It makes us laugh too.