Point out you can't spell his name without "emo"

Craft Nagini into a handbag and give it to Voldie as a Christmas present. When he screams about Horcruxes, ask innocently "what's a Horcrux?"

Offer Voldie a wig, an appointment for a nose job, tanning, a manicure, and a shrink, and a list of alternative hobbies. Recommend knitting, bingo, shuffleboard, marbles, embroidery, event planning, and macaroni art.

Tell him Harry recently died in an "unfortunate Quidditch mishap". When he yells about "NOO!", scream, "Foiled again!"

Say "Dude, get a life. You should be known as "The-Man-Who-Let-A-Boy-Live-7-Times." to Voldie at a meeting when he inevitably rants about how he should be the one to kill Harry Potter. Oops, there goes Charity Burbage...

Replace the Horcrux locket potion with pumpkin juice

Lace his food with Polyjuice Potion, containing Harry's hair

Tell him, "Your mom's so ugly, she married a Muggle."