It wasn't random, but today my act of kindness was to pay my power bill to help keep a power worker employed for another day. 
However, today's random act of kindness was by the taxi driver who brought me home fron grocery shopping... he could see that I was physically struggling and helped me inside with everything. Most taxi drivers won't even get out of the car to unload the boot (trunk) so they can get away quicker, much less help carry stuff inside.
A big
for the taxi driver x 