Learn something new every day

What if you put food dye in it?

...on the bright side, if someone's ever laying siege to your residence, you know how to make mustard gas!

Its actually in cat urine, not so much human urine ._.

Mustard gas doesn't kill you, it only blinds you

So when you put bleach in the toilet and you pee why doesn't that create mustard gas? /:

Exposure to sulfur mustard usually is not fatal. When sulfur mustard was used during World War I, it killed fewer than 5% of the people who were exposed and got medical care.