18 USC §831(a)(4)(B), (g)(1)(C) & (5)(C) make it a federal crime to take enriched uranium from someone by threatening to make them sick.

18 USC §1865 & 36 CFR §2.2(a) make it a federal crime to capture a baby bison, or other animal, in a national park.

21 USC §676 & 9 CFR §316.11(d) make it a federal crime to sell smoke-flavored meat, without saying it’s been smoke-flavored on the label.

21 USC §676 & 9 CFR §317.8(b)(4) make it a federal crime to sell “spring lamb” not killed between March and the first full week of October.

16 USC §1826g(g), (e)(6) & 50 CFR §648.89(e)(2) make it a crime to sexually harass an observer on a boat in Nantucket #NationalLimerickDay
18 USC §491(a) makes it a federal crime to use something that’s shaped like a coin, but isn’t a coin, in a parking meter.

21 USC §676 & 9 CFR §317.8(b)(30) make it a federal crime to sell “Chitterling Pie” or “Calf Chitterlings and Gravy” in a package of >3lbs.

16 USC §668dd & 50 CFR §100.28(b)(4) make it a federal crime for rural Alaskans to use explosives to catch shrimp for their family to eat.

18 USC §1657 makes it a federal crime to write a letter to a pirate.

18 USC §1865 & 36 CFR §13.35(b) & (c)(2) make it a federal crime to take an occupied seashell from a national park in Alaska.

15 USC §1824 makes it a federal crime to transport a sore horse to a horse show, if the horse will be sore when shown in the horse show.