I just played the greatest prank on my mother. Back when Pope Benedict XVI was elected I had DVDR'd it. My mother was in the kitchen doing the dishes. I put the dvd on in the living room and called "Mom! The new Pope! They're announcing him!"
She sprinted in front of the tv and bought it hook, line and sinker. I had a really hard time holding back the laughter. At one point I even had to say I had something in my throat to cover up my snickering. Meanwhile my dad was doing the "gullible" gesture behind her.
She was saying "we didn't even see the smoke!"
Then the part came
" Annuntio vobis gaudium magnum:
Habemus Papam;
Eminentissimum ac reverendissimum Dominum,
Dominum Josephum"

At which point she looked at me and saw me explode in laughter
"You jerk!! I thought I saw you snickering!!"

Imma tell you, I almost pissed my pants...