About Bumps and Laughs

There exists in our office, a seemingly simple and energetic guy from another department. Now, this guy is actually far from the way he appears. He constantly seems to be passing remarks, half the time in his native tongue. More often than not, he keeps bumping into people around the blind corners and then ends up asking them to be careful.....crap!! He in fact bumped into me twice today and ran off without tendering an apology. Sometimes I wonder whether to laugh at, or get angry with such people.