Recently,
@JUL 28 2018, Ethereum charts showed a weird volume spike anomaly. Is it just a data glitch or is it some whale game or perhaps bot-driven manipulation? What do you guys think?

Coinmarketcap displayed wrong volumes for almost 70% of coins, this wasn't due to some bot manipulation or any whale bought and sold ETH. You can see that VeChain fall more than 90% in just couple of hours. They had an anomaly in there application and they'll acknowledge it after thorough investigation, wait for it.