Everybody get what happens when you pull the pin on a grenade? The outcome might be an apt description of what you think might be about to happen at your job. Either way, people who give it a more-than-casual glance will get a kick out of your socks when they realize what’s going on. If you feel like holding forth to anyone who giggles, you could point out that the grenade goes back at least to the Byzantine Empire (and everyone knows what that is, right?). The "pineapple" shaped version that we all recognize was developed in England and first used during World War I. Or you could just say nothing, laugh back, and feel pretty clever.