I used to have the best poker face. I could pull a fast one on my grandmother so easily. We're smart people, but also a tad gullible. I could do the best April Fool's pranks; or even the odd end of the school year "I've failed" joke, right before passing her the report card full of As and Bs. I pulled the "I'm pregnant" trick one year, but that's no longer possible given that I'm by-choice post surgery sterile; nor do I think she'd buy the immaculate conception bit, no matter how much Catholicism she practices. I've got dry wit.