Watch out what you put in your luggage next time you travel abroad—if an unusual item is confiscated from you, it might appear online!

This recent article by the BBC features some of the more peculiar items travellers have tried—and failed—to take across borders. The list is full of the weird and wonderful, ranging from live lobsters to £40,000 in undeclared cash to fluffy handcuffs. According to a report commissioned by London City Airport, the most commonly confiscated items include souvenir snow globes and fancy Harrods jam—both of which contravene the rule against flying with over 100ml of liquid in hand luggage.

Also included in the article are military relics such as unexploded WWI and WWII shells, and potato forks from fondue sets—as they could be used as a weapon.

Sometimes the rules about luggage restrictions may include items which aren’t immediately obvious. It’s important to pay close attention to what is and is not allowed on board an international flight or train journey, so you don’t get caught out. You should always make sure you know what is in your own luggage, and never transport unknown goods for others.

There was recently news about the new businesses allowing travellers to earn extra cash by transporting goods for others, and about the dangers that this industry could pose. Whilst this may seem like a great new feature of the sharing economy, travellers risk being unwittingly caught up in the trafficking of illegal items. Depending on the country and prohibited items in question, such crimes carry harsh penalties, such as long prison sentences or even capital punishment.

To make sure you avoid getting into trouble, you should familiarise yourself with the restrictions placed on luggage. You can use your common sense to avoid panic and evacuation at Paris’s Gare du Nord like these fans of military paraphernalia, but you should check to avoid carrying some of the lesser-known prohibited items too.

For more travel tips to ensure your next trip abroad goes smoothly, check out Prisoners Abroad’s #TravelAware campaign.