Article continues below advertisementBill Hader was spotted in his first outing since he had an unnerving exchange with Nick Reiner at Conan O'Brien's Christmas party over the weekend.The comedian, 47, was seen chatting on the phone and looked like he was in the middle of a tense conversation on December 16.Article continues below advertisementBill Hader Looked Stressed During His Phone CallSource: MEGABill Hader was spotted looking stressed in his first appearance since the holiday bash.He appeared stressed and looked slightly unkept as he paced around in photos obtained by Page Six.