its you, not the car... itll be youre cloats rubbing against the seat covers or something along those lines (shoes on floor mats etc...)
(could just be charging you up as you stand up and rub on the seat)
best idea... would be to keep touching the metal of the car as you drive along, discharging yourself before you become charged up enough to get a shock !
for a test, try toushing something metal before you get out and then once youre out, if you don;t get a shock at first but do later on then you;re charging up as you get out, so you need to keep hold of something metal as you get out
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