Backfireing prank

The best prank that I pulled was that time I bought fart spray that smelled really bad, and me and my friend sprayed it all over their little siblings bedroom. I mean all over the sheets, inside the sheets, inside the pillow case, on the TV, and everything. We were expecting his little sibling to walk in and get mad, but no. His mom came in and stepped out and started to say beep beep beep beep beep that smells like beep a lot of times. I got off the hook, but my friend got grounded for like a month.