In Scratch you can use drums!
Bring the green flag and do the normal things,
Bring the ‘play drum (1) for (0.25) beats’ block form the Sounds section,
Change the (0.25) to (0.75),
If you want, you can change the (1) to another number for a different drum sound.
For an extra challenge, make a ‘dun-dun-crash’ sound after a sprite says a joke!