bizarre transactions involving one address
https://blockchain.info/address/1F89hmmrtonJfAQNAqDmeDadcw7AsZcvXG

The "Unable to decode output address" are as Nate commented OP_RETURN scripts whose purpose is to insert a short message or data snippet into the block chain. They are not so bizarre

Looking at some of the timestamps on the smaller transactions they are not all sent at the same time and fairly spaced out like someone might be manually making the transactions as opposed to a script running.  Each transaction is approx 30 USD so maybe not so unusual?