Please help me decide what to write on cake for a soon to be new father

Tomorrow we're presenting my friend at work (a guy) with a crapload of baby gifts. His wife is due with their first baby end of next month. What do I write on his cake?

Something like 'Congrats Name' or 'Good Luck Name', or 'May the force be with you' ...... I have no idea what to put!

Thanks!!!