The best thing about using IEM's

PolarityMan

The look on the drummers face when he got to the bit in one of our songs that has a really obvious single china cymbal hit with pretty much nothing else playing and in his in-ears (and only his in-ears) he hears the glorious voice of Donald Trump saying "china" perfectly in time with his hit. 

Sample lifted from here:

jasonbone75

You need wizlol for that one. Love it.