Here's an idea: Sabo gets captured by the marines (part of his plan to get inside because he's a reckless bastard) and he's put into a cell right next to Luffy XD they're sitting there waiting for their chance/crew to come and Luffy yells "OI SABO I'M BORED." "ME TOO." "WANNA DO SOMETHING TO PISS OFF THE GURDS?!" basically they sing really loud and annoying and get half the prisoners to join in and piss the guards off before help finally arrives, and they're loving it XD
omfg. YES. ABSOLUTELY. i love everything about this saoijfosaijf they absolutely would
i’ve always headcanoned that while sabo can obv be a goof in his general life, he just gets, like, 200% more annoying and goofy when he’s around luffy. like he feels like he can drop what maturity he has to have as chief of staff and act like a kid again. and that just encourages luffy to be even more silly too, if that’s possible.
which of course results in them becoming the Unholy Duo of Ultimate Childish Annoyingness together, to their enemies’ chagrin :’)