Unfortunately, I love to walk through fresh cut grass barefooted and invariably, it tatoos my feet green! That's embarrassing when you wear sandals to church!
Sand burrs...these buggers are bad enough to pop bicycle tires...our yard was overrun with them when we moved in...we pulled moving box after moving box-fuls at first. Now we just pull the occassional one.
Poisening them doesn't do any good...the burrs remain in the grass and still hurt!