As I was checking out yesterday:
Checker: "Would you like to donate to x---- cancer?" (He either said "prostate" or "breast", I'm not sure which.)
Me: "Not today, thanks." (so I like to know where my money's going and so I don't like being solicited--so sue me.)
Me (smiling weakly): "Besides, shouldn't we be donating to the eradication of cancer instead of to the cancer itself?"
Thankfully he pretended I was amusing and agreed.
Somebody slap me.