Trunks was looking around at the other equipment, after he'd excused himself from talking with Videl--carefully not watching other people, because he was pretty sure that was rude to do.

He wasn't looking straight at the door when Gohan came in--but he caught sight of him out of the corner of his eye, turned before he could even think about it, and was then struck by the complete craziness of it all.

He'd thought hearing Videl talk about his younger self, knowing that at least seven or eight years had passed for them, would have prepared him for seeing the past time's Gohan grown up and looking so similar to how he had the last time Trunks had seen him in his own timeline. It really didn't.

It was another couple of moments before he could shake himself out of his surprise, and out of the memories.

"Um. Hey, Gohan."

Because that's totally appropriate when running into someone you haven't seen for years. Though it hadn't actually been that long for Trunks.