I have become disturbingly hooked on this little applet here:
http://www.liquidcode.org/worm.html
It reminds me a lot of when snake first made its appearance on the Nokia phones. Takes less than 60 seconds to play, but is frustratingly addictive insofar as you always want to beat your old score. Give it a shot, try and beat 2199 (my record).

Of course, maybe it's just me...

2019 - first attempt!