I just started reading the lyrics to Cat Stevens' 'Father and Son' and nearly started crying. I had the same experience in early pregnancy while telling someone about how we used to sing 'Streets of London' at school. Oh, and buskers are making me well up at the minute too!
The funniest one has been the end to the Lil Wayne video 'How to Love' () A pregnant woman goes to the doctor for a pregnancy test and when she gets a positive result she says to her mum 'Thanks for teaching me how to love' - so cheesy but it set me off!
What has got your eyes watering?