We've all done it on the pitch - the ball's gone past you, you're out of position, you stick your arm out, concede a free-kick and sometimes a yellow card.

BBC: The hand of Henry

But if you starve them of possession, they get frustrated and can lose discipline and end up getting yellow and sometimes red cards.

BBC: Zinzan Brooke column

Workers are sometimes not supplied with respirators for handling and cleaning the yellow cake.

CNN: NUCLEAR FALLOUT