There is little in life that offers more potential for embarassment than concluding that your father has undertipped, realizing you don’t have cash on you to make up the difference, and concluding that you must mention it to him, only to realize after you call it to his attention that he has not, in fact, undertipped.
I’m sure it was potentially more embarassing when he forced you to fetch him a switch and then took you over his knee right there in the restaurant while the waitstaff and other patrons looked on.
Truer words, never spoken.