6.022x10^23

Tell a chemistry joke please

two chemists walk into a bar. they exchange glances and right away the bartender knows where this is going. one chemist clears his throat and begins to order a “glass of h2o” while the other sits quietly, almost trembling with anticipation. the first chemist completes his order and the second opens his mouth to hit the h2o2 punchline, but before he can, his head explodes in a mass of red.

the first chemist blinks with surprise as blood, brain and skull fragments splatter all over his pristine white coat and the counter. after a stunned moment of silence, a woman screams and all hell breaks loose. the patrons begin knocking one another in a mad dash to the door as the chemists body slumps off the stool and slides to the floor. the first chemist is still too stunned to speak. 

on the roof of the building across the street, the sniper racks the bolt back and sends the spent case flying as another one takes its place. exhaling, he steadies the crosshairs directly on the head of the only chemist still breathing. the bar is empty now, save for the bartender who’s been watching the scene without a word. 

with wide eyes, the chemist raises his head to face the man behind the counter, only to find him staring intently at the window. he too looks behind him to the panes of glass, only to squint as the laser flits across his eyes. 

“it’s nothing personal,” says the bartender. “strictly business.“ 

the chemist whirls around just in time to see the him dip his head in a curt nod. across the street, the sniper recognizes the signal and pulls the trigger without a moments hesitation, watching dark red fill his scope for the second time that day. raising his head, he pushes himself out of prone and stretches until he feels his phone vibrate. pulling it out of his pocket, he flips it open. 

“what do you want me to do with them?" 

he walks to the edge and looks down at the broken window of the bar below. 

"barium.”