Two men have admitted posting obscene messages on a website which alerts Metro users to where inspectors are waiting.
David Edgar, 26, and Matthew O'Neil, 22, posted the offensive comments on Checky Watch, a page set up on Facebook.
North Tyneside Magistrates heard how Edgar, of Monmouth Gardens, Howdon, wrote how he was planning to fill water balloons with acid and bring them to an organised protest.
Both men admitted sending malicious communications to Nexus staff.
Mark Harrison, defending both men, said his clients had acted without thinking and said they were both extremely sorry for their actions.
Speaking outside the court, O'Neil said: "Fair enough I shouldn't have said it but it was only a bit of banter. I wasn't being serious.
"I think my punishment is very harsh."
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