PMSL but why does it happen ?
mmmm blimey how would I know.
If I apply basic electrical theory...well I guess you are building a static charge as you wonder through your daily routine..maybe the shoes you wear aren't giving you an electrical connection to earth..
now when your lips meet (ah Bless) then you make a connection (in more ways than one)to ground through your old man....the zap is probably the charge as it transfers across from you to the old man..like a lightening bolt kind of thing.
Now that is just a guess..all be it a logicle thoght process I may be completly wrong and an absolute load of tosh...
Dont stop kissing though :hug: