On the road I lived on in Botswana, a snake was spotted by a neighbour on the street outside who called out over the front gate. I went out and it was about the length of your forearm, quite thin, and slow and it slithered down this crack in the tarmac between our 2 houses at seeing us gawk at...
It wasn't full grown, but I did once kill a Black Mamba - it does has a weak spot.
(I didn't know it was Black Mamba until after it was dead, otherwise I wouldn't have gone near it :facepalm:.)