I remember the ad well
VW was touting that their cars were made so well, they were water tight. They actually floated a Bug, told how long it floated, and ran an ad of it
Then the Swimmer had his “bad night”.
Some months later National Lampoon magazine ran an ad parody (1970 I think). There were loud harumphs - and laughter.
VW’s “Two Pennies a Mile” line is more memorable for me.