With a sharp whistle, a man surprises his partner with an adorable puppy for the holidays. In a similar fashion, she whistles in his gift -- a new GMC Sierra. With an astonished look on his face, the man carefully approaches his new truck and embraces it in a loving hug. It appears that both of them got exactly the gift they wanted. During the Season to Upgrade, GMC is offering special savings on select Denali models.