I won’t be happy until we see some of these in Command & Conquer: apparently in the mid-90’s the US military was contemplating a ‘Gay Bomb’:

The plan for a so-called “love bomb” envisaged an aphrodisiac chemical that would provoke widespread homosexual behaviour among troops, causing what the military called a “distasteful but completely non-lethal” blow to morale.

Others up for consideration include a ‘Who? Me?’ bomb which would mimic flatulence, a swarm bomb that would draw swarms of insects on the opponent, a vampire bomb that makes enemy skin unbearably sensitive to sunlight, and a halitosis bomb which gives all the bad guys bad breath. Really, most Magic cards are more plausible than the ideas in this article.

Found via Ludology.