When asked if he had bought one along the prince said: "I'll never be asked twice about drinking, it's very important.
"They tried to put a Jägerbomb in it! imagine my surprise - burnt my throat."
Later, when speaking to guests at the event, William recounted the story.
"They tried to put Jägerbomb instead of rum - that would have sorted me out was expecting rum and got a Jägerbomb."