I've been told that the fewer times your die bounces, the more random the roll will be. The reason given was that each time it bounces, you give an opportunity

I've been told that the fewer times your die bounces, the more random the roll will be. The reason given was that each time it bounces, you give an opportunity for a slightly heavier side to roll towards the bottom. Obviously you should be wary if someone's roll doesn't bounce at all -- they are likely manipulating the throw (make them use a dice cup!). But a too-bouncy table can cheat you too by favoring the heavier side of the die. So, your dice may be trying to kill you, but they're not working alone. Blame the table too!