Just so everyone's aware, it's super duper illegal to deface currency.
So like, it would be against the law to use a sharpie to add a Hitler mustache to Trump's face on said dollar bill; or add an arm extended in a Nazi salute; or add swastikas over 'god' where it says "In god we trust"; to then bring it to a bank and report that you received defaced currency and would like to exchange it for new bills, only to do it all again.
So... y'know, probably don't do those things.