WHY DID TAPLOW LAUGHED AT CROCKER HARRIS JOKE IN BROWNING VERSION?

You're referring to the character Taplow in Terence Rattigan's play "The Winslow Boy." Taplow is not in the Browning Version, which features a different set of characters.

The Browning Version, by the same playwright, is a story about a teacher, Andrew Crocker-Harris, who is facing a midlife crisis and struggles to connect with his students. There is no character named Taplow in this play.

It's possible you're confusing the two plays. Or perhaps you're thinking of another adaptation of "The Winslow Boy" where Taplow might have reacted differently to a joke by Crocker-Harris. If you could provide more context, I might be able to help you further.