Word Association

decrepit

infirm

feeble

puny

teensy

weenie (yellow polka dot bikini...)

roasted

sunburned! (in the teeny weenie bikini lol)

windburn. ( as a guy, not going to talk about, well, you know, the yellow....)

breaker (as in, wind breaker... hehe, thanks for the laugh!)

surf (as in, still in the spirit of yellow polka dot bikinis, sunburn and breakers)

shark ('cause what else could be more exciting than surfs, breakers, and being sunburned in a yellow polka dot bikini?)

Jaws

teeth (Possibly sharks? But more a panicked type of excitement than an enjoyable one?)

dentures (Grandpa's dentures fell out in his excitement. Either it was due to seeing a shark or the yellow polka dot bikini. He wasn't able to tell us.)

implants (Poor grandpa. If he wasn't able to tell you, my guess is it was the shark. At least with yellow polka dot bikinis, most people recover enough to write a song alluding to the experience, even if they're too shy to talk plainly...)

install (I'm guessing it was both. Grandpa was watching some gal in a teeny weeny yellow polka dot bikini. Due to the fact that he was paying too much attention to her attributes, he didn't notice the shark that was approaching the poor gal in time to warn her. I think it was a mixture of good excitement, bad excitement, and guilt. Grandpa hasn't been the same since...not to mention the gal! As the song says, "From the locker to the blanket, from the blanket to the shore, from the shore to the water, guess there isn't any more.")

initiate (Well, there I was feeling sorry for Grandpa, when probably I should have been feeling sorry for the poor gal in the itsy bitsy teenie weenie yellow polka dot bikini. Was Grandpa sure it was a shark, or could it have been an aquatic Whangdoodle? The reason I ask is that sharks tend to go for the meatier meals, and without meaning to insult Grandpa, I think he was the meaty choice compared to whoever could fit into that yellow polka dot bikini. Also, do you happen to know if the girl had been singing "itsy bitsy" or even "teenie weenie" at the time of the incident? If an aquatic whangdoodle believed the gal had been referring to him (rather than her famous - or infamous - bikini), he might have been very insulted, and all the more likely to attack the gal than the Grandpa...)