To late to concentrate!

Is it just me, or does anyone else get giddy sometimes when they should really be being very serious and grown up!?

We just had an important business meeting at home where a man came and talked lots of figures at us and I just wasn't in the mood. The man asked for a black coffee and I just couldn't help giving it him in this mug!!! When I carried it through no one said anything, but on catching my husbands eye, I really had to breathe deeply to avoid snorting or something with laughter!