I just killed

Flies suck, so to let them know it I use a vacuum cleaner to suck them out of the air.

with my tears

My cat catch flies and eat them! :D

An Electric Guitar

with a shotgun

I catch them with a Spoon !

i talk to flies...
hey little little fly..... hey little fly............
come and cryyyyyyyyyyyyyy and dieeeeeeeeeeeeeee!
;)

With a cat.

I release the kraken

with my swat team

I release against them my cat

i don't kill them, because we have treatment: they don't annoy me, i don't kill them

this actually makes me glad there are flies

I grab my bazooka.

AMATEURS

Rubber bands.

Mama! Just killed a man!

With a sniper rifle

I dress up as a femal fly and use myself as bait then drop nuclear bombs on them while licking them gently in their butts

I capture them and force them to fight other flies winner gets set free outside the loser gets fed to the spider.

Grab an ak-47 and start blasting my walls until it dies... Hopefully my house does not turn into swiss cheese in the process.

I fry them with a electric fly swatter.

I capture them alive, stick them in a microwave safe plastic bag, with plenty of room. Stick them in microwave, and put it on "High" for 3 minutes. Watch them dance and explode. I celebrate by nuking a Hot Pocket shortly afterwards.