Severus Snape looked around the office, seeing that Minerva wasn't there, before taking out his wand and pointing at Albus Dumbledore's portrait, neighboring his, and said, smirking:
"Albus, do you want a lemon drop?"
"Why yes, I do, why?" Albus asked, before being buried in a heap of lemon drops. After digging his way out of the lemon flavored sea of candy, he saw Severus laughing like a child. Indignant, he stood up, and pointed his wand at Severus, and also smirked, as Severus immediately stopped laughing, his eyes filled with terror.
"A-albus… I am sure we can talk about thi-" Severus began, before being bombarded with moving stag-shaped gummy bears. After standing up, Severus was absolutely furious. Marching into the Headmasters portrait, he tackled the old man. A brief wrestling match followed, in which Severus ended up being magically pinned to the wall.
"Severus! Albus! What in heavens is going on here?" A sharp voice interrupted, causing Albus to drop Severus, who fell ungracefully to the ground.
Both men looked at each other, at the ground, then at Minerva, before looking away. Severus walked back into his own portrait, and both Headmasters looked like schoolboys after being caught out after curfew. Not being able to bear the irony of it all, Minerva laughed, shocking the two men. She walked out of the office, muttering "Men…" and something that sounded suspiciously like "Stupidity doesn't lessen with age, I see," causing both men to indignantly argue with her back, which continued to shake with laughter.
"Severus, do you know the name of Harrys son?" Albus asked, looking at Severus, smugly.
"No, and I do not care to know."
"His name is-"
"I don't care!" Severus interrupted. Albus marched into Severus' portrait, putting a hand over his mouth.
"You will listen to me. Harry's sons name is Albus-"
"Typical," Severus muttered, his voice muffled from Albus' hand, before being silenced- magically- by Dumbledore.
"His name is Albus Severus Potter" Albus said, catching Severus as he fainted, laughing.
When Severus finally came to, he looked at Albus, grumpily.
"Since when did you act like a Slytherin?" He asked, and Albus laughed before looking at him smugly.
"Always."