Final answer:
Drizzt made Wulfgar nervous by surprising him with the gifting of the magical warhammer Aegis-Fang, a weapon of immense power and responsibility.
Step-by-step explanation:
In the world of R.A. Salvatore's Forgotten Realms series, the characters Drizzt Do'Urden and Wulfgar have a complex relationship. A surprise that Drizzt had and made Wulfgar nervous was his decision to give him the magical warhammer Aegis-Fang. Drizzt had discovered the hidden power of the weapon, and when he entrusted this to Wulfgar, he felt nervous due to the immense responsibility that it entailed.
Learn more about Drizzt and Wulfgar