Hyper-literal humour I keep coming up with

- My local bus service has an advertisement currently running that basically reads "kids travel free all August"

*I need to check if there's a limit on the number of young goats I can bring with me on a given journey. 

- Outside an opticians, they've a sign that states: "free eye test with purchase".

*Does the purchase need to be from this company?

*I'd like to buy a lens cleaning cloth please... And may I book the free eye test?

*(If it turns out there's a minimum £££): I'd like to buy these £300 designer frames please, and have my free eye test. ... I'd like a refund on these frames please"