It's Niko's birthday today, and he's nothing but excited, he's already got a whole big building all to himself, all decorated too, doesn't have a cake and he's not there, though. His heavy-bullet-proof-armor-wearing guards are there, and they decorated their armor to look like suits, one's wearing black and the other's wearing white. Adorable.
Guard 1: "So, when's he gonna be here?"
Guard 2: "He should be here in-"
Niko bursts through the door, holding a cake. He puts it on the table.
"You do not want to know what I went through to get this cake, needless to say, the bakery's closed for good."
He tweets about how it's his birthday and that people should come over and celebrate with him.
"Alright, make sure to take your guns off safety, who knows who might come in."
So yeah, go ahead and bring a gift, or don't, it's your choice.