We were on holiday in Newquay with SIL and BIL before kids. It was boiling so beach day agreed but wanted to pop into town first. Packed stuff up and DH proudly and excitedly announced he'd found a lounger in the cupboard and was going to take it.
It was in a carry bag thing but looked pretty bulky so we said are you sure etc. No, he was not to be swayed.
Off we marched in sweltering heat into town, it was busy and we kept laughing at DH sweating with this bloody lounger but he was smug back "just you wait till I'm relaxing on my luxury lounger and you lot are skimming it and getting all sandy etc etc". Really hamming it up.
So we FINALLY get to the beach and he lugs it the last 300 yards or whatever to the perfect spot. Still lots of banter about how he can finally enjoy his reward etc.
However, as he started to unpack and assemble his precious 'lounger' it became immediately apparent that it was, in fact, a travel cot 

SIL and I were in uncontrollable hysterics that went on far too long. Then the next family over realised what had happened so they started laughing too which just made us go even harder.
DH chucked it on the floor and stomped off to the hire place shouting "I'm going to get a lounger and none of you bastards are allowed anywhere near it"
Funniest. Day. Ever.
And still the words 'travel cot' are enough to render SIL and I absolutely insensible.
Completely outing so if you read this Katy I love you 