What are some nursery rhymes with bad or shocking meanings?

i'm doing a speech on the meanings of nursery rhymes. I'm looking for the popular or "sweet little kid's" rhymes that have a crude or shocking inner/true meaning to the other than what the lyrics say or make you think. I want those 1s that really make you go "WOW! that can't be what it means i always thought that song was so good for little kids." Please send me ALL of the 1s you know. P.S. not ring around the rosie i already know that one. send me all the others though. I need lots of 'em. but i do want 1s like ring around the rosie or worse if u can find them. Thanks in advance 4 all your help.