“The thigh was considered the source of posterity in the ancient world. Or, more properly, the “loins” or the testicles. The phrase “under the thigh” could be a euphemism for “on the loins.” There are two reasons why someone would take an oath in this manner: 1) Abraham had been promised a “seed” by God, and this covenantal blessing was passed on to his son and grandson. Abraham made his trusted servant swear “on the seed of Abraham” that he would find a wife for Isaac. 2) Abraham had received circumcision as the sign of the covenant (Genesis 17:10). Our custom is to swear on a Bible; the Hebrew custom was to swear on circumcision, the mark of God’s covenant. The idea of swearing on one’s loins is found in other cultures, as well. The English word testify is directly related to the word testicles.”

https://www.gotquestions.org/hand-under-thigh.html

It can be sometimes. I do a simple import in one of my personal projects. In case for the client, for over 20 years they have used excel to make all CRUD changes and now they get to build a brand spanking new website to do all of those CRUD changes and they still want to do it in excel.

The customer wants the brand new website we are building them to be able to load data from several types of excel files and then email them an excel file with results. Please shoot me…