This one needs a little backstory so if you don't care then just skip this post.
My phone's got speed dial on it, my mom is 5 (has been forever) and my girlfriend is 8. I just hit the number and then one shoulder button to text. So there's been a few times when I hit to text my mom instead of my girl. A few embarrassing slips but nothing major ever happened. The first time was almost a year ago. So I've been doing it intentionally every month or two to make it seem believable. (Yeah I was planning this for almost a year) Anyways, on the first I sent her this (pretending to send it to my gf):
Look babe, call me when you get out of class cuz we both need time to calm down. I will buy you another test, the one you took might have been a false positive or something.
Ends up my mom was at work when I sent it so she calls me like 3 hours later on her break:
"Hello?" (I made it sound like my voice was trembling)
"Bri...."
"Hey mom... did you get a message earlier?"
"I sure did..." (obviously enraged but holding back)
"Well then, there's probably something I should tell you..."
"Oh, REALLY?! WHAT COULD THAT BE?"
"Well.... you see.... today's april fool's day."
" *~10 seconds of silence* You're a fucking asshole"
She hung up on me and hasn't talked to me since.