To add a one more: the Macbook charging bricks have an MSP430 in them [1], "roughly as powerful as the processor inside the original Macintosh". It's definitely Turing complete; you may not get tons of access to the rest of the machine, but it might serve as a vantage point from which to launch power-based side channel attacks [2] (yes, you only get the overall power draw from this but that's no barrier [3]).
[3] https://m.tau.ac.il/~tromer/handsoff/ "Our attacks use novel side channels and are based on the observation that the "ground" electric potential in many computers fluctuates in a computation-dependent way."
[1] http://www.righto.com/2015/11/macbook-charger-teardown-surpr...
[2] https://en.wikipedia.org/wiki/Power_analysis
[3] https://m.tau.ac.il/~tromer/handsoff/ "Our attacks use novel side channels and are based on the observation that the "ground" electric potential in many computers fluctuates in a computation-dependent way."