And I'll just bet that next comes" I pay your salary", and "I'll have your job". To which I always replied, "Your name is nowhere on my check", and "Take it".
Getting back on track, if you are dumb enough to walk into a car dealer with 15 to 25K on your person, the IRS is dumb enough to DEMAND to know where it came from. If you pay by check, all they need is name, address, and proof of insurance. If you're borrowing (begging for) money, they can pretty much ask for whatever floats their boat.