Minor electric shocks from touching appliances, loose ground?
Anything with exposed metal parts that are not earth grounded is likely to give you a slight sensation due to capacitive coupling between the external metal parts and internal live parts. The sensation could be strengthened a little if the electrical device is powered by an inverter due to higher leakage to ground of harmonic components of the inverter waveform. In addition, some equipment that is designed to be earth grounded through a 3-prong plug may have intentional capacitive connections to ground and even high resistance connections to ground for the purpose of transient voltage suppression.