Did you make that Fermi?
You take your shoes off before you step on a trampoline Probally heard this but it's worth a shot
The feel the leash go slack! (heard this one while listening to some irish tunes)
Because in Japan they're rocksmiths.
Detroit
Because atomic bombs are pretty bright.
It can be a very Hubble-ing experience. These jokes may not be funny for you, but they are Fermi.