Jiraiya's best birthday ever happens after a very successful mission where the client was so impressed he gave him five jugs of his best sake. Afterwards, he claims long and loud that his best present was the kiss that a drunk Tsunade gave him, made even better by the fact that she doesn't remember and he loves infuriating her.

Orochimaru and him both remember the handjob under the table, but neither of them ever talks about it.