My "Damn, I'm old" moment

Had a ticket not to long ago from a QA tester that the phone validation in the UI would accept (000) 000-0000 as valid. During some discussion, I asked if we should validate against "555" numbers, like (XXX) 555-XXXX.

Junior dev asked me what "555" numbers where.

So in order to asauge my feelings of old age, anyone want to share their personal "Damn, I'm old" moments?