It's definitely hilarious, and Drizzt is enjoying himself more than a little. He doesn't know Jarlaxle well, but does know that it is extremely rare for someone to pull one over the mercenary. For someone to confound him and confuse him.

Drizzt tries to keep himself steady, tries to tease Jarlaxle a bit more because it's fun, but the knowledge of the truth about his father no longer being dead wants to explode out of his chest. He starts grinning brightly, more brightly than Jarlaxle has ever seen. Then there's laughter, his lavender orbs shining with pure joy.

"The confusion is yours. We are in a plane of existence entirely different from our own," Drizzt reaches to clasp hands on top of Jarlaxle's shoulders. "And somehow, in this plane, my father is alive!"