Simple:

People were having a wedding party, and the host had forgotten to get enough wine. Jesus didn't give a shit about that kind of Earthly problems, but his mom kept buggering him to use his divine powers to conjure up something to drink, and eventually he turned some water into wine, just to shut her the f*ck up.

Ever since, Catholics have used the strategy of asking Jesus mom to "intercede" on their behalf and bugger him with their inane requests until he gives up and gives them what they want.

This story is in the Bible. Look it up.