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Romeo--"Not I, believe me. You have dancing shoes / With nimble soles; I have a soul of lead…" (Act 1 scene 4)
The pun is on the word "soles" of shoes doubling for Romeo's "soul of lead".
Mercutio- "Ask for me tomorrow, and you shall find me a grave man." (Act 3 sc.1)
The pun is on the word "grave".