It wouldn't be such a problem for Thor to catch Loki – I mean he was much faster and everything; but he was also kind of blind and oblivious; and Loki wasn't stupid. He was hiding all the time, reading books and practicing simple spells in hidden places no one else knew about; not even Heimdall.
The only time he wasn't hiding or sneaking around was during family dinners. The whole family and only people closest to them gathered and there was no way Loki would get away with skipping it or using his tricks during it. So naturally Thor decided that that would be a perfect time to attack.
But he couldn't just go to Loki and hug him; he would probably just run to the other side of the table or hide behind Mom or made a big scene and excuse himself; so Thor made a plan; not a very crafty one but still a plan.
He borrowed some robes from the staff and a beard from the royal theatre. He even found some shoes with thick sole that made him look taller. He gathered everything and changed into his disguise just before dinner. He sneaked out of his room so nobody would see him.
Shoes were just a little bit too big for him and he was constantly tripping on the edge of his long cloak. Fake beard was tickling him and ribbon that held it in place was cutting into his skin. It was horrible.
He stumbled down one of smaller corridors towards the kitchen. The staffs were too busy running around preparing all sorts of dishes, to notice him. He picked up one of the plates and sneaked out, towards the great hall.
Thor felt like an acrobat; balancing the big plate with heavy drinks on it while walking in unstable shoes. He was so proud of himself when he finally came into the hall. He looked around; nobody seemed to notice him. Loki was already there, sitting behind the table, playing with his magic, levitating the fork. He looked bored.
Thor started to walk right towards him. He tried not to smile goofily and ruined his disguise. He was so close.
But then his luck ran out.
He was only few steps away from his brother, when his feet tangled in the edge of his cloak and he stumbled forward. He accidentally grabbed one of the women by the hair, trying to catch his balance. Despite that he fell directly on his face.
At first there was unsettling and confused silence. Then Loki started to laugh.
Nobody else moved, because they had no idea what's going on.
Thor took advantage of their confusion and the fact that Loki was still laughing.
He jumped forward and caught Loki in crushing hug.
"Got you!"
Loki screamed in terror, his voice high like one of a teenage girl. He acted impulsively, stabbing Thor in the shoulder with a fork.
They stared at each other in shock for a moment. Loki first realised what had happened. He smiled slyly and slipped from Thor's grip.
"Till next time, clown prince," he slightly bowed mid running away. Smirk firmly on his lips.
He kissed his startled mother on the cheek, before leaving the room. Thor and everybody else just stood still for a moment, before shrugging their shoulders, and continuing with the dinner.