Last fall, I planted a bunch of crocus bulbs on our back lawn - I made sure they were scattered around under our tree so that they would look natural. The other day, Molt pointed out these:
Hmmmm. Why should about 10 crocuses be sprouting altogether about 20 feet away from the vicinity where I planted them?!?
There are 2 other such clumps in surprising places. I had no idea I could be thwarted this way.