Custom Map Makers

I was messing around on my Spacestation map and found an easter egg. Look at the death message:

You 'sploded, it happens to every 1/50times you 'splode

Actually, I stepped on my own HK69 nade this time. So it must be any way of blowing yourself up.

I saw it some days ago too, I thought 'did I install a map with mods again?'